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 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

  * vim: set ts=8 sts=4 et sw=4 tw=99:

  * This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 /*

  * JS date methods.

  *

  * "For example, OS/360 devotes 26 bytes of the permanently

  *  resident date-turnover routine to the proper handling of

  *  December 31 on leap years (when it is Day 366).  That

  *  might have been left to the operator."

  *

  * Frederick Brooks, 'The Second-System Effect'.

  */

 #include "jsdate.h"

 #include "mozilla/ArrayUtils.h"

 #include "mozilla/FloatingPoint.h"

 #include <ctype.h>

 #include <math.h>

 #include <string.h>

 #include "jsapi.h"

 #include "jscntxt.h"

 #include "jsnum.h"

 #include "jsobj.h"

 #include "jsprf.h"

 #include "jsstr.h"

 #include "jstypes.h"

 #include "jsutil.h"

 #include "prmjtime.h"

 #include "js/Date.h"

 #include "vm/DateTime.h"

 #include "vm/GlobalObject.h"

 #include "vm/Interpreter.h"

 #include "vm/NumericConversions.h"

 #include "vm/String.h"

 #include "vm/StringBuffer.h"

 #include "jsobjinlines.h"

 using namespace js;

 using namespace js::types;

 using mozilla::ArrayLength;

 using mozilla::IsFinite;

 using mozilla::IsNaN;

 using JS::GenericNaN;

 /*

  * The JS 'Date' object is patterned after the Java 'Date' object.

  * Here is a script:

  *

  *    today = new Date();

  *

  *    print(today.toLocaleString());

  *

  *    weekDay = today.getDay();

  *

  *

  * These Java (and ECMA-262) methods are supported:

  *

  *     UTC

  *     getDate (getUTCDate)

  *     getDay (getUTCDay)

  *     getHours (getUTCHours)

  *     getMinutes (getUTCMinutes)

  *     getMonth (getUTCMonth)

  *     getSeconds (getUTCSeconds)

  *     getMilliseconds (getUTCMilliseconds)

  *     getTime

  *     getTimezoneOffset

  *     getYear

  *     getFullYear (getUTCFullYear)

  *     parse

  *     setDate (setUTCDate)

  *     setHours (setUTCHours)

  *     setMinutes (setUTCMinutes)

  *     setMonth (setUTCMonth)

  *     setSeconds (setUTCSeconds)

  *     setMilliseconds (setUTCMilliseconds)

  *     setTime

  *     setYear (setFullYear, setUTCFullYear)

  *     toGMTString (toUTCString)

  *     toLocaleString

  *     toString

  *

  *

  * These Java methods are not supported

  *

  *     setDay

  *     before

  *     after

  *     equals

  *     hashCode

  */

 static inline double

 Day(double t)

 {

     return floor(t / msPerDay);

 }

 static double

 TimeWithinDay(double t)

 {

     double result = fmod(t, msPerDay);

     if (result < 0)

         result += msPerDay;

     return result;

 }

 /* ES5 15.9.1.3. */

 static inline bool

 IsLeapYear(double year)

 {

     JS_ASSERT(ToInteger(year) == year);

     return fmod(year, 4) == 0 && (fmod(year, 100) != 0 || fmod(year, 400) == 0);

 }

 static inline double

 DaysInYear(double year)

 {

     if (!IsFinite(year))

         return GenericNaN();

     return IsLeapYear(year) ? 366 : 365;

 }

 static inline double

 DayFromYear(double y)

 {

     return 365 * (y - 1970) +

            floor((y - 1969) / 4.0) -

            floor((y - 1901) / 100.0) +

            floor((y - 1601) / 400.0);

 }

 static inline double

 TimeFromYear(double y)

 {

     return DayFromYear(y) * msPerDay;

 }

 static double

 YearFromTime(double t)

 {

     if (!IsFinite(t))

         return GenericNaN();

     JS_ASSERT(ToInteger(t) == t);

     double y = floor(t / (msPerDay * 365.2425)) + 1970;

     double t2 = TimeFromYear(y);

     /*

      * Adjust the year if the approximation was wrong.  Since the year was

      * computed using the average number of ms per year, it will usually

      * be wrong for dates within several hours of a year transition.

      */

     if (t2 > t) {

         y--;

     } else {

         if (t2 + msPerDay * DaysInYear(y) <= t)

             y++;

     }

     return y;

 }

 static inline int

 DaysInFebruary(double year)

 {

     return IsLeapYear(year) ? 29 : 28;

 }

 /* ES5 15.9.1.4. */

 static inline double

 DayWithinYear(double t, double year)

 {

     JS_ASSERT_IF(IsFinite(t), YearFromTime(t) == year);

     return Day(t) - DayFromYear(year);

 }

 static double

 MonthFromTime(double t)

 {

     if (!IsFinite(t))

         return GenericNaN();

     double year = YearFromTime(t);

     double d = DayWithinYear(t, year);

     int step;

     if (d < (step = 31))

         return 0;

     if (d < (step += DaysInFebruary(year)))

         return 1;

     if (d < (step += 31))

         return 2;

     if (d < (step += 30))

         return 3;

     if (d < (step += 31))

         return 4;

     if (d < (step += 30))

         return 5;

     if (d < (step += 31))

         return 6;

     if (d < (step += 31))

         return 7;

     if (d < (step += 30))

         return 8;

     if (d < (step += 31))

         return 9;

     if (d < (step += 30))

         return 10;

     return 11;

 }

 /* ES5 15.9.1.5. */

 static double

 DateFromTime(double t)

 {

     if (!IsFinite(t))

         return GenericNaN();

     double year = YearFromTime(t);

     double d = DayWithinYear(t, year);

     int next;

     if (d <= (next = 30))

         return d + 1;

     int step = next;

     if (d <= (next += DaysInFebruary(year)))

         return d - step;

     step = next;

     if (d <= (next += 31))

         return d - step;

     step = next;

     if (d <= (next += 30))

         return d - step;

     step = next;

     if (d <= (next += 31))

         return d - step;

     step = next;

     if (d <= (next += 30))

         return d - step;

     step = next;

     if (d <= (next += 31))

         return d - step;

     step = next;

     if (d <= (next += 31))

         return d - step;

     step = next;

     if (d <= (next += 30))

         return d - step;

     step = next;

     if (d <= (next += 31))

         return d - step;

     step = next;

     if (d <= (next += 30))

         return d - step;

     step = next;

     return d - step;

 }

 /* ES5 15.9.1.6. */

 static int

 WeekDay(double t)

 {

     /*

      * We can't assert TimeClip(t) == t because we call this function with

      * local times, which can be offset outside TimeClip's permitted range.

      */

     JS_ASSERT(ToInteger(t) == t);

     int result = (int(Day(t)) + 4) % 7;

     if (result < 0)

         result += 7;

     return result;

 }

 static inline int

 DayFromMonth(int month, bool isLeapYear)

 {

     /*

      * The following array contains the day of year for the first day of

      * each month, where index 0 is January, and day 0 is January 1.

      */

     static const int firstDayOfMonth[2][13] = {

         {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},

         {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}

     };

     JS_ASSERT(0 <= month && month <= 12);

     return firstDayOfMonth[isLeapYear][month];

 }

 template<typename T>

 static inline int

 DayFromMonth(T month, bool isLeapYear) MOZ_DELETE;

 /* ES5 15.9.1.12 (out of order to accommodate DaylightSavingTA). */

 static double

 MakeDay(double year, double month, double date)

 {

     /* Step 1. */

     if (!IsFinite(year) || !IsFinite(month) || !IsFinite(date))

         return GenericNaN();

     /* Steps 2-4. */

     double y = ToInteger(year);

     double m = ToInteger(month);

     double dt = ToInteger(date);

     /* Step 5. */

     double ym = y + floor(m / 12);

     /* Step 6. */

     int mn = int(fmod(m, 12.0));

     if (mn < 0)

         mn += 12;

     /* Steps 7-8. */

     bool leap = IsLeapYear(ym);

     double yearday = floor(TimeFromYear(ym) / msPerDay);

     double monthday = DayFromMonth(mn, leap);

     return yearday + monthday + dt - 1;

 }

 /* ES5 15.9.1.13 (out of order to accommodate DaylightSavingTA). */

 static inline double

 MakeDate(double day, double time)

 {

     /* Step 1. */

     if (!IsFinite(day) || !IsFinite(time))

         return GenericNaN();

     /* Step 2. */

     return day * msPerDay + time;

 }

 JS_PUBLIC_API(double)

 JS::MakeDate(double year, unsigned month, unsigned day)

 {

     return TimeClip(::MakeDate(MakeDay(year, month, day), 0));

 }

 JS_PUBLIC_API(double)

 JS::YearFromTime(double time)

 {

     return ::YearFromTime(time);

 }

 JS_PUBLIC_API(double)

 JS::MonthFromTime(double time)

 {

     return ::MonthFromTime(time);

 }

 JS_PUBLIC_API(double)

 JS::DayFromTime(double time)

 {

     return DateFromTime(time);

 }

 /*

  * Find a year for which any given date will fall on the same weekday.

  *

  * This function should be used with caution when used other than

  * for determining DST; it hasn't been proven not to produce an

  * incorrect year for times near year boundaries.

  */

 static int

 EquivalentYearForDST(int year)

 {

     /*

      * Years and leap years on which Jan 1 is a Sunday, Monday, etc.

      *

      * yearStartingWith[0][i] is an example non-leap year where

      * Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.

      *

      * yearStartingWith[1][i] is an example leap year where

      * Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.

      */

     static const int yearStartingWith[2][7] = {

         {1978, 1973, 1974, 1975, 1981, 1971, 1977},

         {1984, 1996, 1980, 1992, 1976, 1988, 1972}

     };

     int day = int(DayFromYear(year) + 4) % 7;

     if (day < 0)

         day += 7;

     return yearStartingWith[IsLeapYear(year)][day];

 }

 /* ES5 15.9.1.8. */

 static double

 DaylightSavingTA(double t, DateTimeInfo *dtInfo)

 {

     if (!IsFinite(t))

         return GenericNaN();

     /*

      * If earlier than 1970 or after 2038, potentially beyond the ken of

      * many OSes, map it to an equivalent year before asking.

      */

     if (t < 0.0 || t > 2145916800000.0) {

         int year = EquivalentYearForDST(int(YearFromTime(t)));

         double day = MakeDay(year, MonthFromTime(t), DateFromTime(t));

         t = MakeDate(day, TimeWithinDay(t));

     }

     int64_t utcMilliseconds = static_cast<int64_t>(t);

     int64_t offsetMilliseconds = dtInfo->getDSTOffsetMilliseconds(utcMilliseconds);

     return static_cast<double>(offsetMilliseconds);

 }

 static double

 AdjustTime(double date, DateTimeInfo *dtInfo)

 {

     double t = DaylightSavingTA(date, dtInfo) + dtInfo->localTZA();

     t = (dtInfo->localTZA() >= 0) ? fmod(t, msPerDay) : -fmod(msPerDay - t, msPerDay);

     return t;

 }

 /* ES5 15.9.1.9. */

 static double

 LocalTime(double t, DateTimeInfo *dtInfo)

 {

     return t + AdjustTime(t, dtInfo);

 }

 static double

 UTC(double t, DateTimeInfo *dtInfo)

 {

     return t - AdjustTime(t - dtInfo->localTZA(), dtInfo);

 }

 /* ES5 15.9.1.10. */

 static double

 HourFromTime(double t)

 {

     double result = fmod(floor(t/msPerHour), HoursPerDay);

     if (result < 0)

         result += HoursPerDay;

     return result;

 }

 static double

 MinFromTime(double t)

 {

     double result = fmod(floor(t / msPerMinute), MinutesPerHour);

     if (result < 0)

         result += MinutesPerHour;

     return result;

 }

 static double

 SecFromTime(double t)

 {

     double result = fmod(floor(t / msPerSecond), SecondsPerMinute);

     if (result < 0)

         result += SecondsPerMinute;

     return result;

 }

 static double

 msFromTime(double t)

 {

     double result = fmod(t, msPerSecond);

     if (result < 0)

         result += msPerSecond;

     return result;

 }

 /* ES5 15.9.1.11. */

 static double

 MakeTime(double hour, double min, double sec, double ms)

 {

     /* Step 1. */

     if (!IsFinite(hour) ||

         !IsFinite(min) ||

         !IsFinite(sec) ||

         !IsFinite(ms))

     {

         return GenericNaN();

     }

     /* Step 2. */

     double h = ToInteger(hour);

     /* Step 3. */

     double m = ToInteger(min);

     /* Step 4. */

     double s = ToInteger(sec);

     /* Step 5. */

     double milli = ToInteger(ms);

     /* Steps 6-7. */

     return h * msPerHour + m * msPerMinute + s * msPerSecond + milli;

 }

 /**

  * end of ECMA 'support' functions

  */

 static bool

 date_convert(JSContext *cx, HandleObject obj, JSType hint, MutableHandleValue vp)

 {

     JS_ASSERT(hint == JSTYPE_NUMBER || hint == JSTYPE_STRING || hint == JSTYPE_VOID);

     JS_ASSERT(obj->is<DateObject>());

     return DefaultValue(cx, obj, (hint == JSTYPE_VOID) ? JSTYPE_STRING : hint, vp);

 }

 /* for use by date_parse */

 static const char* const wtb[] = {

     "am", "pm",

     "monday", "tuesday", "wednesday", "thursday", "friday",

     "saturday", "sunday",

     "january", "february", "march", "april", "may", "june",

     "july", "august", "september", "october", "november", "december",

     "gmt", "ut", "utc",

     "est", "edt",

     "cst", "cdt",

     "mst", "mdt",

     "pst", "pdt"

     /* time zone table needs to be expanded */

 };

 static const int ttb[] = {

     -1, -2, 0, 0, 0, 0, 0, 0, 0,       /* AM/PM */

     2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,

     10000 + 0, 10000 + 0, 10000 + 0,   /* GMT/UT/UTC */

     10000 + 5 * 60, 10000 + 4 * 60,    /* EST/EDT */

     10000 + 6 * 60, 10000 + 5 * 60,    /* CST/CDT */

     10000 + 7 * 60, 10000 + 6 * 60,    /* MST/MDT */

     10000 + 8 * 60, 10000 + 7 * 60     /* PST/PDT */

 };

 /* helper for date_parse */

 static bool

 date_regionMatches(const char* s1, int s1off, const jschar* s2, int s2off,

                    int count, int ignoreCase)

 {

     bool result = false;

     /* return true if matches, otherwise, false */

     while (count > 0 && s1[s1off] && s2[s2off]) {

         if (ignoreCase) {

             if (unicode::ToLowerCase(s1[s1off]) != unicode::ToLowerCase(s2[s2off]))

                 break;

         } else {

             if ((jschar)s1[s1off] != s2[s2off]) {

                 break;

             }

         }

         s1off++;

         s2off++;

         count--;

     }

     if (count == 0) {

         result = true;

     }

     return result;

 }

 /* find UTC time from given date... no 1900 correction! */

 static double

 date_msecFromDate(double year, double mon, double mday, double hour,

                   double min, double sec, double msec)

 {

     return MakeDate(MakeDay(year, mon, mday), MakeTime(hour, min, sec, msec));

 }

 /* compute the time in msec (unclipped) from the given args */

 #define MAXARGS        7

 static bool

 date_msecFromArgs(JSContext *cx, CallArgs args, double *rval)

 {

     unsigned loop;

     double array[MAXARGS];

     double msec_time;

     for (loop = 0; loop < MAXARGS; loop++) {

         if (loop < args.length()) {

             double d;

             if (!ToNumber(cx, args[loop], &d))

                 return false;

             /* return NaN if any arg is not finite */

             if (!IsFinite(d)) {

                 *rval = GenericNaN();

                 return true;

             }

             array[loop] = ToInteger(d);

         } else {

             if (loop == 2) {

                 array[loop] = 1; /* Default the date argument to 1. */

             } else {

                 array[loop] = 0;

             }

         }

     }

     /* adjust 2-digit years into the 20th century */

     if (array[0] >= 0 && array[0] <= 99)

         array[0] += 1900;

     msec_time = date_msecFromDate(array[0], array[1], array[2],

                                   array[3], array[4], array[5], array[6]);

     *rval = msec_time;

     return true;

 }

 /*

  * See ECMA 15.9.4.[3-10];

  */

 static bool

 date_UTC(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     double msec_time;

     if (!date_msecFromArgs(cx, args, &msec_time))

         return false;

     msec_time = TimeClip(msec_time);

     args.rval().setNumber(msec_time);

     return true;

 }

 /*

  * Read and convert decimal digits from s[*i] into *result

  * while *i < limit.

  *

  * Succeed if any digits are converted. Advance *i only

  * as digits are consumed.

  */

 static bool

 digits(size_t *result, const jschar *s, size_t *i, size_t limit)

 {

     size_t init = *i;

     *result = 0;

     while (*i < limit &&

            ('0' <= s[*i] && s[*i] <= '9')) {

         *result *= 10;

         *result += (s[*i] - '0');

         ++(*i);

     }

     return *i != init;

 }

 /*

  * Read and convert decimal digits to the right of a decimal point,

  * representing a fractional integer, from s[*i] into *result

  * while *i < limit.

  *

  * Succeed if any digits are converted. Advance *i only

  * as digits are consumed.

  */

 static bool

 fractional(double *result, const jschar *s, size_t *i, size_t limit)

 {

     double factor = 0.1;

     size_t init = *i;

     *result = 0.0;

     while (*i < limit &&

            ('0' <= s[*i] && s[*i] <= '9')) {

         *result += (s[*i] - '0') * factor;

         factor *= 0.1;

         ++(*i);

     }

     return *i != init;

 }

 /*

  * Read and convert exactly n decimal digits from s[*i]

  * to s[min(*i+n,limit)] into *result.

  *

  * Succeed if exactly n digits are converted. Advance *i only

  * on success.

  */

 static bool

 ndigits(size_t n, size_t *result, const jschar *s, size_t* i, size_t limit)

 {

     size_t init = *i;

     if (digits(result, s, i, Min(limit, init+n)))

         return (*i - init) == n;

     *i = init;

     return false;

 }

 static int

 DaysInMonth(int year, int month)

 {

     bool leap = IsLeapYear(year);

     int result = int(DayFromMonth(month, leap) - DayFromMonth(month - 1, leap));

     return result;

 }

 /*

  * Parse a string in one of the date-time formats given by the W3C

  * "NOTE-datetime" specification. These formats make up a restricted

  * profile of the ISO 8601 format. Quoted here:

  *

  *   The formats are as follows. Exactly the components shown here

  *   must be present, with exactly this punctuation. Note that the "T"

  *   appears literally in the string, to indicate the beginning of the

  *   time element, as specified in ISO 8601.

  *

  *   Any combination of the date formats with the time formats is

  *   allowed, and also either the date or the time can be missing.

  *

  *   The specification is silent on the meaning when fields are

  *   ommitted so the interpretations are a guess, but hopefully a

  *   reasonable one. We default the month to January, the day to the

  *   1st, and hours minutes and seconds all to 0. If the date is

  *   missing entirely then we assume 1970-01-01 so that the time can

  *   be aded to a date later. If the time is missing then we assume

  *   00:00 UTC.  If the time is present but the time zone field is

  *   missing then we use local time.

  *

  * Date part:

  *

  *  Year:

  *     YYYY (eg 1997)

  *

  *  Year and month:

  *     YYYY-MM (eg 1997-07)

  *

  *  Complete date:

  *     YYYY-MM-DD (eg 1997-07-16)

  *

  * Time part:

  *

  *  Hours and minutes:

  *     Thh:mmTZD (eg T19:20+01:00)

  *

  *  Hours, minutes and seconds:

  *     Thh:mm:ssTZD (eg T19:20:30+01:00)

  *

  *  Hours, minutes, seconds and a decimal fraction of a second:

  *     Thh:mm:ss.sTZD (eg T19:20:30.45+01:00)

  *

  * where:

  *

  *   YYYY = four-digit year or six digit year as +YYYYYY or -YYYYYY

  *   MM   = two-digit month (01=January, etc.)

  *   DD   = two-digit day of month (01 through 31)

  *   hh   = two digits of hour (00 through 23) (am/pm NOT allowed)

  *   mm   = two digits of minute (00 through 59)

  *   ss   = two digits of second (00 through 59)

  *   s    = one or more digits representing a decimal fraction of a second

  *   TZD  = time zone designator (Z or +hh:mm or -hh:mm or missing for local)

  */

 static bool

 date_parseISOString(JSLinearString *str, double *result, DateTimeInfo *dtInfo)

 {

     double msec;

     const jschar *s;

     size_t limit;

     size_t i = 0;

     int tzMul = 1;

     int dateMul = 1;

     size_t year = 1970;

     size_t month = 1;

     size_t day = 1;

     size_t hour = 0;

     size_t min = 0;

     size_t sec = 0;

     double frac = 0;

     bool isLocalTime = false;

     size_t tzHour = 0;

     size_t tzMin = 0;

 #define PEEK(ch) (i < limit && s[i] == ch)

 #define NEED(ch)                                                     \

     JS_BEGIN_MACRO                                                   \

         if (i >= limit || s[i] != ch) { goto syntax; } else { ++i; } \

     JS_END_MACRO

 #define DONE_DATE_UNLESS(ch)                                            \

     JS_BEGIN_MACRO                                                      \

         if (i >= limit || s[i] != ch) { goto done_date; } else { ++i; } \

     JS_END_MACRO

 #define DONE_UNLESS(ch)                                            \

     JS_BEGIN_MACRO                                                 \

         if (i >= limit || s[i] != ch) { goto done; } else { ++i; } \

     JS_END_MACRO

 #define NEED_NDIGITS(n, field)                                      \

     JS_BEGIN_MACRO                                                  \

         if (!ndigits(n, &field, s, &i, limit)) { goto syntax; }     \

     JS_END_MACRO

     s = str->chars();

     limit = str->length();

     if (PEEK('+') || PEEK('-')) {

         if (PEEK('-'))

             dateMul = -1;

         ++i;

         NEED_NDIGITS(6, year);

     } else if (!PEEK('T')) {

         NEED_NDIGITS(4, year);

     }

     DONE_DATE_UNLESS('-');

     NEED_NDIGITS(2, month);

     DONE_DATE_UNLESS('-');

     NEED_NDIGITS(2, day);

  done_date:

     DONE_UNLESS('T');

     NEED_NDIGITS(2, hour);

     NEED(':');

     NEED_NDIGITS(2, min);

     if (PEEK(':')) {

         ++i;

         NEED_NDIGITS(2, sec);

         if (PEEK('.')) {

             ++i;

             if (!fractional(&frac, s, &i, limit))

                 goto syntax;

         }

     }

     if (PEEK('Z')) {

         ++i;

     } else if (PEEK('+') || PEEK('-')) {

         if (PEEK('-'))

             tzMul = -1;

         ++i;

         NEED_NDIGITS(2, tzHour);

         /*

          * Non-standard extension to the ISO date format (permitted by ES5):

          * allow "-0700" as a time zone offset, not just "-07:00".

          */

         if (PEEK(':'))

           ++i;

         NEED_NDIGITS(2, tzMin);

     } else {

         isLocalTime = true;

     }

  done:

     if (year > 275943 // ceil(1e8/365) + 1970

         || (month == 0 || month > 12)

         || (day == 0 || day > size_t(DaysInMonth(year,month)))

         || hour > 24

         || ((hour == 24) && (min > 0 || sec > 0))

         || min > 59

         || sec > 59

         || tzHour > 23

         || tzMin > 59)

         goto syntax;

     if (i != limit)

         goto syntax;

     month -= 1; /* convert month to 0-based */

     msec = date_msecFromDate(dateMul * (double)year, month, day,

                              hour, min, sec,

                              frac * 1000.0);;

     if (isLocalTime) {

         msec = UTC(msec, dtInfo);

     } else {

         msec -= ((tzMul) * ((tzHour * msPerHour)

                             + (tzMin * msPerMinute)));

     }

     if (msec < -8.64e15 || msec > 8.64e15)

         goto syntax;

     *result = msec;

     return true;

  syntax:

     /* syntax error */

     *result = 0;

     return false;

 #undef PEEK

 #undef NEED

 #undef DONE_UNLESS

 #undef NEED_NDIGITS

 }

 static bool

 date_parseString(JSLinearString *str, double *result, DateTimeInfo *dtInfo)

 {

     double msec;

     const jschar *s;

     size_t limit;

     size_t i = 0;

     int year = -1;

     int mon = -1;

     int mday = -1;

     int hour = -1;

     int min = -1;

     int sec = -1;

     int c = -1;

     int n = -1;

     int tzoffset = -1;

     int prevc = 0;

     bool seenplusminus = false;

     int temp;

     bool seenmonthname = false;

     if (date_parseISOString(str, result, dtInfo))

         return true;

     s = str->chars();

     limit = str->length();

     if (limit == 0)

         goto syntax;

     while (i < limit) {

         c = s[i];

         i++;

         if (c <= ' ' || c == ',' || c == '-') {

             if (c == '-' && '0' <= s[i] && s[i] <= '9') {

               prevc = c;

             }

             continue;

         }

         if (c == '(') { /* comments) */

             int depth = 1;

             while (i < limit) {

                 c = s[i];

                 i++;

                 if (c == '(') depth++;

                 else if (c == ')')

                     if (--depth <= 0)

                         break;

             }

             continue;

         }

         if ('0' <= c && c <= '9') {

             n = c - '0';

             while (i < limit && '0' <= (c = s[i]) && c <= '9') {

                 n = n * 10 + c - '0';

                 i++;

             }

             /* allow TZA before the year, so

              * 'Wed Nov 05 21:49:11 GMT-0800 1997'

              * works */

             /* uses of seenplusminus allow : in TZA, so Java

              * no-timezone style of GMT+4:30 works

              */

             if ((prevc == '+' || prevc == '-')/*  && year>=0 */) {

                 /* make ':' case below change tzoffset */

                 seenplusminus = true;

                 /* offset */

                 if (n < 24)

                     n = n * 60; /* EG. "GMT-3" */

                 else

                     n = n % 100 + n / 100 * 60; /* eg "GMT-0430" */

                 if (prevc == '+')       /* plus means east of GMT */

                     n = -n;

                 if (tzoffset != 0 && tzoffset != -1)

                     goto syntax;

                 tzoffset = n;

             } else if (prevc == '/' && mon >= 0 && mday >= 0 && year < 0) {

                 if (c <= ' ' || c == ',' || c == '/' || i >= limit)

                     year = n;

                 else

                     goto syntax;

             } else if (c == ':') {

                 if (hour < 0)

                     hour = /*byte*/ n;

                 else if (min < 0)

                     min = /*byte*/ n;

                 else

                     goto syntax;

             } else if (c == '/') {

                 /* until it is determined that mon is the actual

                    month, keep it as 1-based rather than 0-based */

                 if (mon < 0)

                     mon = /*byte*/ n;

                 else if (mday < 0)

                     mday = /*byte*/ n;

                 else

                     goto syntax;

             } else if (i < limit && c != ',' && c > ' ' && c != '-' && c != '(') {

                 goto syntax;

             } else if (seenplusminus && n < 60) {  /* handle GMT-3:30 */

                 if (tzoffset < 0)

                     tzoffset -= n;

                 else

                     tzoffset += n;

             } else if (hour >= 0 && min < 0) {

                 min = /*byte*/ n;

             } else if (prevc == ':' && min >= 0 && sec < 0) {

                 sec = /*byte*/ n;

             } else if (mon < 0) {

                 mon = /*byte*/n;

             } else if (mon >= 0 && mday < 0) {

                 mday = /*byte*/ n;

             } else if (mon >= 0 && mday >= 0 && year < 0) {

                 year = n;

             } else {

                 goto syntax;

             }

             prevc = 0;

         } else if (c == '/' || c == ':' || c == '+' || c == '-') {

             prevc = c;

         } else {

             size_t st = i - 1;

             int k;

             while (i < limit) {

                 c = s[i];

                 if (!(('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')))

                     break;

                 i++;

             }

             if (i <= st + 1)

                 goto syntax;

             for (k = ArrayLength(wtb); --k >= 0;)

                 if (date_regionMatches(wtb[k], 0, s, st, i-st, 1)) {

                     int action = ttb[k];

                     if (action != 0) {

                         if (action < 0) {

                             /*

                              * AM/PM. Count 12:30 AM as 00:30, 12:30 PM as

                              * 12:30, instead of blindly adding 12 if PM.

                              */

                             JS_ASSERT(action == -1 || action == -2);

                             if (hour > 12 || hour < 0) {

                                 goto syntax;

                             } else {

                                 if (action == -1 && hour == 12) { /* am */

                                     hour = 0;

                                 } else if (action == -2 && hour != 12) { /* pm */

                                     hour += 12;

                                 }

                             }

                         } else if (action <= 13) { /* month! */

                             /* Adjust mon to be 1-based until the final values

                                for mon, mday and year are adjusted below */

                             if (seenmonthname) {

                                 goto syntax;

                             }

                             seenmonthname = true;

                             temp = /*byte*/ (action - 2) + 1;

                             if (mon < 0) {

                                 mon = temp;

                             } else if (mday < 0) {

                                 mday = mon;

                                 mon = temp;

                             } else if (year < 0) {

                                 year = mon;

                                 mon = temp;

                             } else {

                                 goto syntax;

                             }

                         } else {

                             tzoffset = action - 10000;

                         }

                     }

                     break;

                 }

             if (k < 0)

                 goto syntax;

             prevc = 0;

         }

     }

     if (year < 0 || mon < 0 || mday < 0)

         goto syntax;

     /*

       Case 1. The input string contains an English month name.

               The form of the string can be month f l, or f month l, or

               f l month which each evaluate to the same date.

               If f and l are both greater than or equal to 70, or

               both less than 70, the date is invalid.

               The year is taken to be the greater of the values f, l.

               If the year is greater than or equal to 70 and less than 100,

               it is considered to be the number of years after 1900.

       Case 2. The input string is of the form "f/m/l" where f, m and l are

               integers, e.g. 7/16/45.

               Adjust the mon, mday and year values to achieve 100% MSIE

               compatibility.

               a. If 0 <= f < 70, f/m/l is interpreted as month/day/year.

                  i.  If year < 100, it is the number of years after 1900

                  ii. If year >= 100, it is the number of years after 0.

               b. If 70 <= f < 100

                  i.  If m < 70, f/m/l is interpreted as

                      year/month/day where year is the number of years after

                      1900.

                  ii. If m >= 70, the date is invalid.

               c. If f >= 100

                  i.  If m < 70, f/m/l is interpreted as

                      year/month/day where year is the number of years after 0.

                  ii. If m >= 70, the date is invalid.

     */

     if (seenmonthname) {

         if ((mday >= 70 && year >= 70) || (mday < 70 && year < 70)) {

             goto syntax;

         }

         if (mday > year) {

             temp = year;

             year = mday;

             mday = temp;

         }

         if (year >= 70 && year < 100) {

             year += 1900;

         }

     } else if (mon < 70) { /* (a) month/day/year */

         if (year < 100) {

             year += 1900;

         }

     } else if (mon < 100) { /* (b) year/month/day */

         if (mday < 70) {

             temp = year;

             year = mon + 1900;

             mon = mday;

             mday = temp;

         } else {

             goto syntax;

         }

     } else { /* (c) year/month/day */

         if (mday < 70) {

             temp = year;

             year = mon;

             mon = mday;

             mday = temp;

         } else {

             goto syntax;

         }

     }

     mon -= 1; /* convert month to 0-based */

     if (sec < 0)

         sec = 0;

     if (min < 0)

         min = 0;

     if (hour < 0)

         hour = 0;

     msec = date_msecFromDate(year, mon, mday, hour, min, sec, 0);

     if (tzoffset == -1) { /* no time zone specified, have to use local */

         msec = UTC(msec, dtInfo);

     } else {

         msec += tzoffset * msPerMinute;

     }

     *result = msec;

     return true;

 syntax:

     /* syntax error */

     *result = 0;

     return false;

 }

 static bool

 date_parse(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     if (args.length() == 0) {

         args.rval().setNaN();

         return true;

     }

     JSString *str = ToString<CanGC>(cx, args[0]);

     if (!str)

         return false;

     JSLinearString *linearStr = str->ensureLinear(cx);

     if (!linearStr)

         return false;

     double result;

     if (!date_parseString(linearStr, &result, &cx->runtime()->dateTimeInfo)) {

         args.rval().setNaN();

         return true;

     }

     result = TimeClip(result);

     args.rval().setNumber(result);

     return true;

 }

 static inline double

 NowAsMillis()

 {

     return (double) (PRMJ_Now() / PRMJ_USEC_PER_MSEC);

 }

 static bool

 date_now(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     args.rval().setDouble(NowAsMillis());

     return true;

 }

 void

 DateObject::setUTCTime(double t, Value *vp)

 {

     for (size_t ind = COMPONENTS_START_SLOT; ind < RESERVED_SLOTS; ind++)

         setReservedSlot(ind, UndefinedValue());

     setFixedSlot(UTC_TIME_SLOT, DoubleValue(t));

     if (vp)

         vp->setDouble(t);

 }

 void

 DateObject::fillLocalTimeSlots(DateTimeInfo *dtInfo)

 {

     /* Check if the cache is already populated. */

     if (!getReservedSlot(LOCAL_TIME_SLOT).isUndefined() &&

         getReservedSlot(TZA_SLOT).toDouble() == dtInfo->localTZA())

     {

         return;

     }

     /* Remember timezone used to generate the local cache. */

     setReservedSlot(TZA_SLOT, DoubleValue(dtInfo->localTZA()));

     double utcTime = UTCTime().toNumber();

     if (!IsFinite(utcTime)) {

         for (size_t ind = COMPONENTS_START_SLOT; ind < RESERVED_SLOTS; ind++)

             setReservedSlot(ind, DoubleValue(utcTime));

         return;

     }

     double localTime = LocalTime(utcTime, dtInfo);

     setReservedSlot(LOCAL_TIME_SLOT, DoubleValue(localTime));

     int year = (int) floor(localTime /(msPerDay * 365.2425)) + 1970;

     double yearStartTime = TimeFromYear(year);

     /* Adjust the year in case the approximation was wrong, as in YearFromTime. */

     int yearDays;

     if (yearStartTime > localTime) {

         year--;

         yearStartTime -= (msPerDay * DaysInYear(year));

         yearDays = DaysInYear(year);

     } else {

         yearDays = DaysInYear(year);

         double nextStart = yearStartTime + (msPerDay * yearDays);

         if (nextStart <= localTime) {

             year++;

             yearStartTime = nextStart;

             yearDays = DaysInYear(year);

         }

     }

     setReservedSlot(LOCAL_YEAR_SLOT, Int32Value(year));

     uint64_t yearTime = uint64_t(localTime - yearStartTime);

     int yearSeconds = uint32_t(yearTime / 1000);

     int day = yearSeconds / int(SecondsPerDay);

     int step = -1, next = 30;

     int month;

     do {

         if (day <= next) {

             month = 0;

             break;

         }

         step = next;

         next += ((yearDays == 366) ? 29 : 28);

         if (day <= next) {

             month = 1;

             break;

         }

         step = next;

         if (day <= (next += 31)) {

             month = 2;

             break;

         }

         step = next;

         if (day <= (next += 30)) {

             month = 3;

             break;

         }

         step = next;

         if (day <= (next += 31)) {

             month = 4;

             break;

         }

         step = next;

         if (day <= (next += 30)) {

             month = 5;

             break;

         }

         step = next;

         if (day <= (next += 31)) {

             month = 6;

             break;

         }

         step = next;

         if (day <= (next += 31)) {

             month = 7;

             break;

         }

         step = next;

         if (day <= (next += 30)) {

             month = 8;

             break;

         }

         step = next;

         if (day <= (next += 31)) {

             month = 9;

             break;

         }

         step = next;

         if (day <= (next += 30)) {

             month = 10;

             break;

         }

         step = next;

         month = 11;

     } while (0);

     setReservedSlot(LOCAL_MONTH_SLOT, Int32Value(month));

     setReservedSlot(LOCAL_DATE_SLOT, Int32Value(day - step));

     int weekday = WeekDay(localTime);

     setReservedSlot(LOCAL_DAY_SLOT, Int32Value(weekday));

     int seconds = yearSeconds % 60;

     setReservedSlot(LOCAL_SECONDS_SLOT, Int32Value(seconds));

     int minutes = (yearSeconds / 60) % 60;

     setReservedSlot(LOCAL_MINUTES_SLOT, Int32Value(minutes));

     int hours = (yearSeconds / (60 * 60)) % 24;

     setReservedSlot(LOCAL_HOURS_SLOT, Int32Value(hours));

 }

 inline double

 DateObject::cachedLocalTime(DateTimeInfo *dtInfo)

 {

     fillLocalTimeSlots(dtInfo);

     return getReservedSlot(LOCAL_TIME_SLOT).toDouble();

 }

 MOZ_ALWAYS_INLINE bool

 IsDate(HandleValue v)

 {

     return v.isObject() && v.toObject().is<DateObject>();

 }

 /*

  * See ECMA 15.9.5.4 thru 15.9.5.23

  */

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getTime_impl(JSContext *cx, CallArgs args)

 {

     args.rval().set(args.thisv().toObject().as<DateObject>().UTCTime());

     return true;

 }

 static bool

 date_getTime(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getTime_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getYear_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     Value yearVal = dateObj->getReservedSlot(LOCAL_YEAR_SLOT);

     if (yearVal.isInt32()) {

         /* Follow ECMA-262 to the letter, contrary to IE JScript. */

         int year = yearVal.toInt32() - 1900;

         args.rval().setInt32(year);

     } else {

         args.rval().set(yearVal);

     }

     return true;

 }

 static bool

 date_getYear(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getYear_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getFullYear_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_YEAR_SLOT));

     return true;

 }

 static bool

 date_getFullYear(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getFullYear_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCFullYear_impl(JSContext *cx, CallArgs args)

 {

     double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (IsFinite(result))

         result = YearFromTime(result);

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getUTCFullYear(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCFullYear_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getMonth_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_MONTH_SLOT));

     return true;

 }

 static bool

 date_getMonth(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getMonth_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCMonth_impl(JSContext *cx, CallArgs args)

 {

     double d = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     args.rval().setNumber(MonthFromTime(d));

     return true;

 }

 static bool

 date_getUTCMonth(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCMonth_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getDate_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_DATE_SLOT));

     return true;

 }

 static bool

 date_getDate(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getDate_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCDate_impl(JSContext *cx, CallArgs args)

 {

     double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (IsFinite(result))

         result = DateFromTime(result);

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getUTCDate(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCDate_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getDay_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_DAY_SLOT));

     return true;

 }

 static bool

 date_getDay(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getDay_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCDay_impl(JSContext *cx, CallArgs args)

 {

     double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (IsFinite(result))

         result = WeekDay(result);

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getUTCDay(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCDay_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getHours_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_HOURS_SLOT));

     return true;

 }

 static bool

 date_getHours(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getHours_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCHours_impl(JSContext *cx, CallArgs args)

 {

     double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (IsFinite(result))

         result = HourFromTime(result);

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getUTCHours(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCHours_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getMinutes_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_MINUTES_SLOT));

     return true;

 }

 static bool

 date_getMinutes(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getMinutes_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCMinutes_impl(JSContext *cx, CallArgs args)

 {

     double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (IsFinite(result))

         result = MinFromTime(result);

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getUTCMinutes(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCMinutes_impl>(cx, args);

 }

 /* Date.getSeconds is mapped to getUTCSeconds */

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCSeconds_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     dateObj->fillLocalTimeSlots(&cx->runtime()->dateTimeInfo);

     args.rval().set(dateObj->getReservedSlot(LOCAL_SECONDS_SLOT));

     return true;

 }

 static bool

 date_getUTCSeconds(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCSeconds_impl>(cx, args);

 }

 /* Date.getMilliseconds is mapped to getUTCMilliseconds */

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getUTCMilliseconds_impl(JSContext *cx, CallArgs args)

 {

     double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (IsFinite(result))

         result = msFromTime(result);

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getUTCMilliseconds(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getUTCMilliseconds_impl>(cx, args);

 }

 /* static */ MOZ_ALWAYS_INLINE bool

 DateObject::getTimezoneOffset_impl(JSContext *cx, CallArgs args)

 {

     DateObject *dateObj = &args.thisv().toObject().as<DateObject>();

     double utctime = dateObj->UTCTime().toNumber();

     double localtime = dateObj->cachedLocalTime(&cx->runtime()->dateTimeInfo);

     /*

      * Return the time zone offset in minutes for the current locale that is

      * appropriate for this time. This value would be a constant except for

      * daylight savings time.

      */

     double result = (utctime - localtime) / msPerMinute;

     args.rval().setNumber(result);

     return true;

 }

 static bool

 date_getTimezoneOffset(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, DateObject::getTimezoneOffset_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setTime_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     if (args.length() == 0) {

         dateObj->setUTCTime(GenericNaN(), args.rval().address());

         return true;

     }

     double result;

     if (!ToNumber(cx, args[0], &result))

         return false;

     dateObj->setUTCTime(TimeClip(result), args.rval().address());

     return true;

 }

 static bool

 date_setTime(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setTime_impl>(cx, args);

 }

 static bool

 GetMsecsOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *millis)

 {

     if (args.length() <= i) {

         *millis = msFromTime(t);

         return true;

     }

     return ToNumber(cx, args[i], millis);

 }

 static bool

 GetSecsOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *sec)

 {

     if (args.length() <= i) {

         *sec = SecFromTime(t);

         return true;

     }

     return ToNumber(cx, args[i], sec);

 }

 static bool

 GetMinsOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *mins)

 {

     if (args.length() <= i) {

         *mins = MinFromTime(t);

         return true;

     }

     return ToNumber(cx, args[i], mins);

 }

 /* ES5 15.9.5.28. */

 MOZ_ALWAYS_INLINE bool

 date_setMilliseconds_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = LocalTime(dateObj->UTCTime().toNumber(), &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double milli;

     if (!ToNumber(cx, args.get(0), &milli))

         return false;

     double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli);

     /* Step 3. */

     double u = TimeClip(UTC(MakeDate(Day(t), time), &cx->runtime()->dateTimeInfo));

     /* Steps 4-5. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 static bool

 date_setMilliseconds(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setMilliseconds_impl>(cx, args);

 }

 /* ES5 15.9.5.29. */

 MOZ_ALWAYS_INLINE bool

 date_setUTCMilliseconds_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = dateObj->UTCTime().toNumber();

     /* Step 2. */

     double milli;

     if (!ToNumber(cx, args.get(0), &milli))

         return false;

     double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli);

     /* Step 3. */

     double v = TimeClip(MakeDate(Day(t), time));

     /* Steps 4-5. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 static bool

 date_setUTCMilliseconds(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCMilliseconds_impl>(cx, args);

 }

 /* ES5 15.9.5.30. */

 MOZ_ALWAYS_INLINE bool

 date_setSeconds_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = LocalTime(dateObj->UTCTime().toNumber(), &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double s;

     if (!ToNumber(cx, args.get(0), &s))

         return false;

     /* Step 3. */

     double milli;

     if (!GetMsecsOrDefault(cx, args, 1, t, &milli))

         return false;

     /* Step 4. */

     double date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));

     /* Step 5. */

     double u = TimeClip(UTC(date, &cx->runtime()->dateTimeInfo));

     /* Steps 6-7. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.31. */

 static bool

 date_setSeconds(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setSeconds_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setUTCSeconds_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = dateObj->UTCTime().toNumber();

     /* Step 2. */

     double s;

     if (!ToNumber(cx, args.get(0), &s))

         return false;

     /* Step 3. */

     double milli;

     if (!GetMsecsOrDefault(cx, args, 1, t, &milli))

         return false;

     /* Step 4. */

     double date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));

     /* Step 5. */

     double v = TimeClip(date);

     /* Steps 6-7. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.32. */

 static bool

 date_setUTCSeconds(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCSeconds_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setMinutes_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = LocalTime(dateObj->UTCTime().toNumber(), &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double m;

     if (!ToNumber(cx, args.get(0), &m))

         return false;

     /* Step 3. */

     double s;

     if (!GetSecsOrDefault(cx, args, 1, t, &s))

         return false;

     /* Step 4. */

     double milli;

     if (!GetMsecsOrDefault(cx, args, 2, t, &milli))

         return false;

     /* Step 5. */

     double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));

     /* Step 6. */

     double u = TimeClip(UTC(date, &cx->runtime()->dateTimeInfo));

     /* Steps 7-8. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.33. */

 static bool

 date_setMinutes(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setMinutes_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setUTCMinutes_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = dateObj->UTCTime().toNumber();

     /* Step 2. */

     double m;

     if (!ToNumber(cx, args.get(0), &m))

         return false;

     /* Step 3. */

     double s;

     if (!GetSecsOrDefault(cx, args, 1, t, &s))

         return false;

     /* Step 4. */

     double milli;

     if (!GetMsecsOrDefault(cx, args, 2, t, &milli))

         return false;

     /* Step 5. */

     double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));

     /* Step 6. */

     double v = TimeClip(date);

     /* Steps 7-8. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.34. */

 static bool

 date_setUTCMinutes(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCMinutes_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setHours_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = LocalTime(dateObj->UTCTime().toNumber(), &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double h;

     if (!ToNumber(cx, args.get(0), &h))

         return false;

     /* Step 3. */

     double m;

     if (!GetMinsOrDefault(cx, args, 1, t, &m))

         return false;

     /* Step 4. */

     double s;

     if (!GetSecsOrDefault(cx, args, 2, t, &s))

         return false;

     /* Step 5. */

     double milli;

     if (!GetMsecsOrDefault(cx, args, 3, t, &milli))

         return false;

     /* Step 6. */

     double date = MakeDate(Day(t), MakeTime(h, m, s, milli));

     /* Step 6. */

     double u = TimeClip(UTC(date, &cx->runtime()->dateTimeInfo));

     /* Steps 7-8. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.35. */

 static bool

 date_setHours(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setHours_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setUTCHours_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = dateObj->UTCTime().toNumber();

     /* Step 2. */

     double h;

     if (!ToNumber(cx, args.get(0), &h))

         return false;

     /* Step 3. */

     double m;

     if (!GetMinsOrDefault(cx, args, 1, t, &m))

         return false;

     /* Step 4. */

     double s;

     if (!GetSecsOrDefault(cx, args, 2, t, &s))

         return false;

     /* Step 5. */

     double milli;

     if (!GetMsecsOrDefault(cx, args, 3, t, &milli))

         return false;

     /* Step 6. */

     double newDate = MakeDate(Day(t), MakeTime(h, m, s, milli));

     /* Step 7. */

     double v = TimeClip(newDate);

     /* Steps 8-9. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.36. */

 static bool

 date_setUTCHours(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCHours_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setDate_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = LocalTime(dateObj->UTCTime().toNumber(), &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double date;

     if (!ToNumber(cx, args.get(0), &date))

         return false;

     /* Step 3. */

     double newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), date), TimeWithinDay(t));

     /* Step 4. */

     double u = TimeClip(UTC(newDate, &cx->runtime()->dateTimeInfo));

     /* Steps 5-6. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 /* ES5 15.9.5.37. */

 static bool

 date_setDate(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setDate_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_setUTCDate_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = dateObj->UTCTime().toNumber();

     /* Step 2. */

     double date;

     if (!ToNumber(cx, args.get(0), &date))

         return false;

     /* Step 3. */

     double newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), date), TimeWithinDay(t));

     /* Step 4. */

     double v = TimeClip(newDate);

     /* Steps 5-6. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 static bool

 date_setUTCDate(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCDate_impl>(cx, args);

 }

 static bool

 GetDateOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *date)

 {

     if (args.length() <= i) {

         *date = DateFromTime(t);

         return true;

     }

     return ToNumber(cx, args[i], date);

 }

 static bool

 GetMonthOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *month)

 {

     if (args.length() <= i) {

         *month = MonthFromTime(t);

         return true;

     }

     return ToNumber(cx, args[i], month);

 }

 /* ES5 15.9.5.38. */

 MOZ_ALWAYS_INLINE bool

 date_setMonth_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = LocalTime(dateObj->UTCTime().toNumber(), &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double m;

     if (!ToNumber(cx, args.get(0), &m))

         return false;

     /* Step 3. */

     double date;

     if (!GetDateOrDefault(cx, args, 1, t, &date))

         return false;

     /* Step 4. */

     double newDate = MakeDate(MakeDay(YearFromTime(t), m, date), TimeWithinDay(t));

     /* Step 5. */

     double u = TimeClip(UTC(newDate, &cx->runtime()->dateTimeInfo));

     /* Steps 6-7. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 static bool

 date_setMonth(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setMonth_impl>(cx, args);

 }

 /* ES5 15.9.5.39. */

 MOZ_ALWAYS_INLINE bool

 date_setUTCMonth_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = dateObj->UTCTime().toNumber();

     /* Step 2. */

     double m;

     if (!ToNumber(cx, args.get(0), &m))

         return false;

     /* Step 3. */

     double date;

     if (!GetDateOrDefault(cx, args, 1, t, &date))

         return false;

     /* Step 4. */

     double newDate = MakeDate(MakeDay(YearFromTime(t), m, date), TimeWithinDay(t));

     /* Step 5. */

     double v = TimeClip(newDate);

     /* Steps 6-7. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 static bool

 date_setUTCMonth(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCMonth_impl>(cx, args);

 }

 static double

 ThisLocalTimeOrZero(Handle<DateObject*> dateObj, DateTimeInfo *dtInfo)

 {

     double t = dateObj->UTCTime().toNumber();

     if (IsNaN(t))

         return +0;

     return LocalTime(t, dtInfo);

 }

 static double

 ThisUTCTimeOrZero(Handle<DateObject*> dateObj)

 {

     double t = dateObj->as<DateObject>().UTCTime().toNumber();

     return IsNaN(t) ? +0 : t;

 }

 /* ES5 15.9.5.40. */

 MOZ_ALWAYS_INLINE bool

 date_setFullYear_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = ThisLocalTimeOrZero(dateObj, &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double y;

     if (!ToNumber(cx, args.get(0), &y))

         return false;

     /* Step 3. */

     double m;

     if (!GetMonthOrDefault(cx, args, 1, t, &m))

         return false;

     /* Step 4. */

     double date;

     if (!GetDateOrDefault(cx, args, 2, t, &date))

         return false;

     /* Step 5. */

     double newDate = MakeDate(MakeDay(y, m, date), TimeWithinDay(t));

     /* Step 6. */

     double u = TimeClip(UTC(newDate, &cx->runtime()->dateTimeInfo));

     /* Steps 7-8. */

     dateObj->setUTCTime(u, args.rval().address());

     return true;

 }

 static bool

 date_setFullYear(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setFullYear_impl>(cx, args);

 }

 /* ES5 15.9.5.41. */

 MOZ_ALWAYS_INLINE bool

 date_setUTCFullYear_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = ThisUTCTimeOrZero(dateObj);

     /* Step 2. */

     double y;

     if (!ToNumber(cx, args.get(0), &y))

         return false;

     /* Step 3. */

     double m;

     if (!GetMonthOrDefault(cx, args, 1, t, &m))

         return false;

     /* Step 4. */

     double date;

     if (!GetDateOrDefault(cx, args, 2, t, &date))

         return false;

     /* Step 5. */

     double newDate = MakeDate(MakeDay(y, m, date), TimeWithinDay(t));

     /* Step 6. */

     double v = TimeClip(newDate);

     /* Steps 7-8. */

     dateObj->setUTCTime(v, args.rval().address());

     return true;

 }

 static bool

 date_setUTCFullYear(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setUTCFullYear_impl>(cx, args);

 }

 /* ES5 Annex B.2.5. */

 MOZ_ALWAYS_INLINE bool

 date_setYear_impl(JSContext *cx, CallArgs args)

 {

     Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

     /* Step 1. */

     double t = ThisLocalTimeOrZero(dateObj, &cx->runtime()->dateTimeInfo);

     /* Step 2. */

     double y;

     if (!ToNumber(cx, args.get(0), &y))

         return false;

     /* Step 3. */

     if (IsNaN(y)) {

         dateObj->setUTCTime(GenericNaN(), args.rval().address());

         return true;

     }

     /* Step 4. */

     double yint = ToInteger(y);

     if (0 <= yint && yint <= 99)

         yint += 1900;

     /* Step 5. */

     double day = MakeDay(yint, MonthFromTime(t), DateFromTime(t));

     /* Step 6. */

     double u = UTC(MakeDate(day, TimeWithinDay(t)), &cx->runtime()->dateTimeInfo);

     /* Steps 7-8. */

     dateObj->setUTCTime(TimeClip(u), args.rval().address());

     return true;

 }

 static bool

 date_setYear(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_setYear_impl>(cx, args);

 }

 /* constants for toString, toUTCString */

 static const char js_NaN_date_str[] = "Invalid Date";

 static const char * const days[] =

 {

    "Sun","Mon","Tue","Wed","Thu","Fri","Sat"

 };

 static const char * const months[] =

 {

    "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"

 };

 // Avoid dependence on PRMJ_FormatTimeUSEnglish, because it

 // requires a PRMJTime... which only has 16-bit years.  Sub-ECMA.

 static void

 print_gmt_string(char* buf, size_t size, double utctime)

 {

     JS_ASSERT(TimeClip(utctime) == utctime);

     JS_snprintf(buf, size, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",

                 days[int(WeekDay(utctime))],

                 int(DateFromTime(utctime)),

                 months[int(MonthFromTime(utctime))],

                 int(YearFromTime(utctime)),

                 int(HourFromTime(utctime)),

                 int(MinFromTime(utctime)),

                 int(SecFromTime(utctime)));

 }

 static void

 print_iso_string(char* buf, size_t size, double utctime)

 {

     JS_ASSERT(TimeClip(utctime) == utctime);

     JS_snprintf(buf, size, "%.4d-%.2d-%.2dT%.2d:%.2d:%.2d.%.3dZ",

                 int(YearFromTime(utctime)),

                 int(MonthFromTime(utctime)) + 1,

                 int(DateFromTime(utctime)),

                 int(HourFromTime(utctime)),

                 int(MinFromTime(utctime)),

                 int(SecFromTime(utctime)),

                 int(msFromTime(utctime)));

 }

 /* ES5 B.2.6. */

 MOZ_ALWAYS_INLINE bool

 date_toGMTString_impl(JSContext *cx, CallArgs args)

 {

     double utctime = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     char buf[100];

     if (!IsFinite(utctime))

         JS_snprintf(buf, sizeof buf, js_NaN_date_str);

     else

         print_gmt_string(buf, sizeof buf, utctime);

     JSString *str = JS_NewStringCopyZ(cx, buf);

     if (!str)

         return false;

     args.rval().setString(str);

     return true;

 }

 /* ES5 15.9.5.43. */

 static bool

 date_toGMTString(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_toGMTString_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 date_toISOString_impl(JSContext *cx, CallArgs args)

 {

     double utctime = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();

     if (!IsFinite(utctime)) {

         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_INVALID_DATE);

         return false;

     }

     char buf[100];

     print_iso_string(buf, sizeof buf, utctime);

     JSString *str = JS_NewStringCopyZ(cx, buf);

     if (!str)

         return false;

     args.rval().setString(str);

     return true;

 }

 static bool

 date_toISOString(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsDate, date_toISOString_impl>(cx, args);

 }

 /* ES5 15.9.5.44. */

 static bool

 date_toJSON(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     /* Step 1. */

     RootedObject obj(cx, ToObject(cx, args.thisv()));

     if (!obj)

         return false;

     /* Step 2. */

     RootedValue tv(cx, ObjectValue(*obj));

     if (!ToPrimitive(cx, JSTYPE_NUMBER, &tv))

         return false;

     /* Step 3. */

     if (tv.isDouble() && !IsFinite(tv.toDouble())) {

         args.rval().setNull();

         return true;

     }

     /* Step 4. */

     RootedValue toISO(cx);

     if (!JSObject::getProperty(cx, obj, obj, cx->names().toISOString, &toISO))

         return false;

     /* Step 5. */

     if (!js_IsCallable(toISO)) {

         JS_ReportErrorFlagsAndNumber(cx, JSREPORT_ERROR, js_GetErrorMessage, nullptr,

                                      JSMSG_BAD_TOISOSTRING_PROP);

         return false;

     }

     /* Step 6. */

     InvokeArgs args2(cx);

     if (!args2.init(0))

         return false;

     args2.setCallee(toISO);

     args2.setThis(ObjectValue(*obj));

     if (!Invoke(cx, args2))

         return false;

     args.rval().set(args2.rval());

     return true;

 }

 /* for Date.toLocaleFormat; interface to PRMJTime date struct.

  */

 static void

 new_explode(double timeval, PRMJTime *split, DateTimeInfo *dtInfo)

 {

     double year = YearFromTime(timeval);

     split->tm_usec = int32_t(msFromTime(timeval)) * 1000;

     split->tm_sec = int8_t(SecFromTime(timeval));

     split->tm_min = int8_t(MinFromTime(timeval));

     split->tm_hour = int8_t(HourFromTime(timeval));

     split->tm_mday = int8_t(DateFromTime(timeval));

     split->tm_mon = int8_t(MonthFromTime(timeval));

     split->tm_wday = int8_t(WeekDay(timeval));

     split->tm_year = year;

     split->tm_yday = int16_t(DayWithinYear(timeval, year));

     /* not sure how this affects things, but it doesn't seem

        to matter. */

     split->tm_isdst = (DaylightSavingTA(timeval, dtInfo) != 0);

 }

 typedef enum formatspec {

     FORMATSPEC_FULL, FORMATSPEC_DATE, FORMATSPEC_TIME

 } formatspec;

 /* helper function */

 static bool

 date_format(JSContext *cx, double date, formatspec format, MutableHandleValue rval)

 {

     char buf[100];

     char tzbuf[100];

     bool usetz;

     size_t i, tzlen;

     PRMJTime split;

     if (!IsFinite(date)) {

         JS_snprintf(buf, sizeof buf, js_NaN_date_str);

     } else {

         JS_ASSERT(TimeClip(date) == date);

         double local = LocalTime(date, &cx->runtime()->dateTimeInfo);

         /* offset from GMT in minutes.  The offset includes daylight savings,

            if it applies. */

         int minutes = (int) floor(AdjustTime(date, &cx->runtime()->dateTimeInfo) / msPerMinute);

         /* map 510 minutes to 0830 hours */

         int offset = (minutes / 60) * 100 + minutes % 60;

         /* print as "Wed Nov 05 19:38:03 GMT-0800 (PST) 1997" The TZA is

          * printed as 'GMT-0800' rather than as 'PST' to avoid

          * operating-system dependence on strftime (which

          * PRMJ_FormatTimeUSEnglish calls, for %Z only.)  win32 prints

          * PST as 'Pacific Standard Time.'  This way we always know

          * what we're getting, and can parse it if we produce it.

          * The OS TZA string is included as a comment.

          */

         /* get a timezone string from the OS to include as a

            comment. */

         new_explode(date, &split, &cx->runtime()->dateTimeInfo);

         if (PRMJ_FormatTime(tzbuf, sizeof tzbuf, "(%Z)", &split) != 0) {

             /* Decide whether to use the resulting timezone string.

              *

              * Reject it if it contains any non-ASCII, non-alphanumeric

              * characters.  It's then likely in some other character

              * encoding, and we probably won't display it correctly.

              */

             usetz = true;

             tzlen = strlen(tzbuf);

             if (tzlen > 100) {

                 usetz = false;

             } else {

                 for (i = 0; i < tzlen; i++) {

                     jschar c = tzbuf[i];

                     if (c > 127 ||

                         !(isalpha(c) || isdigit(c) ||

                           c == ' ' || c == '(' || c == ')')) {

                         usetz = false;

                     }

                 }

             }

             /* Also reject it if it's not parenthesized or if it's '()'. */

             if (tzbuf[0] != '(' || tzbuf[1] == ')')

                 usetz = false;

         } else

             usetz = false;

         switch (format) {

           case FORMATSPEC_FULL:

             /*

              * Avoid dependence on PRMJ_FormatTimeUSEnglish, because it

              * requires a PRMJTime... which only has 16-bit years.  Sub-ECMA.

              */

             /* Tue Oct 31 2000 09:41:40 GMT-0800 (PST) */

             JS_snprintf(buf, sizeof buf,

                         "%s %s %.2d %.4d %.2d:%.2d:%.2d GMT%+.4d%s%s",

                         days[int(WeekDay(local))],

                         months[int(MonthFromTime(local))],

                         int(DateFromTime(local)),

                         int(YearFromTime(local)),

                         int(HourFromTime(local)),

                         int(MinFromTime(local)),

                         int(SecFromTime(local)),

                         offset,

                         usetz ? " " : "",

                         usetz ? tzbuf : "");

             break;

           case FORMATSPEC_DATE:

             /* Tue Oct 31 2000 */

             JS_snprintf(buf, sizeof buf,

                         "%s %s %.2d %.4d",

                         days[int(WeekDay(local))],

                         months[int(MonthFromTime(local))],

                         int(DateFromTime(local)),

                         int(YearFromTime(local)));

             break;

           case FORMATSPEC_TIME:

             /* 09:41:40 GMT-0800 (PST) */

             JS_snprintf(buf, sizeof buf,

                         "%.2d:%.2d:%.2d GMT%+.4d%s%s",

                         int(HourFromTime(local)),

                         int(MinFromTime(local)),

                         int(SecFromTime(local)),

                         offset,

                         usetz ? " " : "",

                         usetz ? tzbuf : "");

             break;

         }

     }

     JSString *str = JS_NewStringCopyZ(cx, buf);

     if (!str)

         return false;

     rval.setString(str);

     return true;

 }

 static bool

 ToLocaleFormatHelper(JSContext *cx, HandleObject obj, const char *format, MutableHandleValue rval)

 {

     double utctime = obj->as<DateObject>().UTCTime().toNumber();