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 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 #include "base/time/time.h"

 #include <limits>

 #include <ostream>

 #include "base/float_util.h"

 #include "base/logging.h"

 #include "base/third_party/nspr/prtime.h"

 #include "base/third_party/nspr/prtypes.h"

 namespace base {

 // TimeDelta ------------------------------------------------------------------

 int TimeDelta::InDays() const {

   return static_cast<int>(delta_ / Time::kMicrosecondsPerDay);

 }

 int TimeDelta::InHours() const {

   return static_cast<int>(delta_ / Time::kMicrosecondsPerHour);

 }

 int TimeDelta::InMinutes() const {

   return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute);

 }

 double TimeDelta::InSecondsF() const {

   return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond;

 }

 int64 TimeDelta::InSeconds() const {

   return delta_ / Time::kMicrosecondsPerSecond;

 }

 double TimeDelta::InMillisecondsF() const {

   return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;

 }

 int64 TimeDelta::InMilliseconds() const {

   return delta_ / Time::kMicrosecondsPerMillisecond;

 }

 int64 TimeDelta::InMillisecondsRoundedUp() const {

   return (delta_ + Time::kMicrosecondsPerMillisecond - 1) /

       Time::kMicrosecondsPerMillisecond;

 }

 int64 TimeDelta::InMicroseconds() const {

   return delta_;

 }

 // Time -----------------------------------------------------------------------

 // static

 Time Time::Max() {

   return Time(std::numeric_limits<int64>::max());

 }

 // static

 Time Time::FromTimeT(time_t tt) {

   if (tt == 0)

     return Time();  // Preserve 0 so we can tell it doesn't exist.

   if (tt == std::numeric_limits<time_t>::max())

     return Max();

   return Time((tt * kMicrosecondsPerSecond) + kTimeTToMicrosecondsOffset);

 }

 time_t Time::ToTimeT() const {

   if (is_null())

     return 0;  // Preserve 0 so we can tell it doesn't exist.

   if (is_max()) {

     // Preserve max without offset to prevent overflow.

     return std::numeric_limits<time_t>::max();

   }

   if (std::numeric_limits<int64>::max() - kTimeTToMicrosecondsOffset <= us_) {

     DLOG(WARNING) << "Overflow when converting base::Time with internal " <<

                      "value " << us_ << " to time_t.";

     return std::numeric_limits<time_t>::max();

   }

   return (us_ - kTimeTToMicrosecondsOffset) / kMicrosecondsPerSecond;

 }

 // static

 Time Time::FromDoubleT(double dt) {

   if (dt == 0 || IsNaN(dt))

     return Time();  // Preserve 0 so we can tell it doesn't exist.

   if (dt == std::numeric_limits<double>::max())

     return Max();

   return Time(static_cast<int64>((dt *

                                   static_cast<double>(kMicrosecondsPerSecond)) +

                                  kTimeTToMicrosecondsOffset));

 }

 double Time::ToDoubleT() const {

   if (is_null())

     return 0;  // Preserve 0 so we can tell it doesn't exist.

   if (is_max()) {

     // Preserve max without offset to prevent overflow.

     return std::numeric_limits<double>::max();

   }

   return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /

           static_cast<double>(kMicrosecondsPerSecond));

 }

 #if defined(OS_POSIX)

 // static

 Time Time::FromTimeSpec(const timespec& ts) {

   return FromDoubleT(ts.tv_sec +

                      static_cast<double>(ts.tv_nsec) /

                          base::Time::kNanosecondsPerSecond);

 }

 #endif

 // static

 Time Time::FromJsTime(double ms_since_epoch) {

   // The epoch is a valid time, so this constructor doesn't interpret

   // 0 as the null time.

   if (ms_since_epoch == std::numeric_limits<double>::max())

     return Max();

   return Time(static_cast<int64>(ms_since_epoch * kMicrosecondsPerMillisecond) +

               kTimeTToMicrosecondsOffset);

 }

 double Time::ToJsTime() const {

   if (is_null()) {

     // Preserve 0 so the invalid result doesn't depend on the platform.

     return 0;

   }

   if (is_max()) {

     // Preserve max without offset to prevent overflow.

     return std::numeric_limits<double>::max();

   }

   return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /

           kMicrosecondsPerMillisecond);

 }

 int64 Time::ToJavaTime() const {

   if (is_null()) {

     // Preserve 0 so the invalid result doesn't depend on the platform.

     return 0;

   }

   if (is_max()) {

     // Preserve max without offset to prevent overflow.

     return std::numeric_limits<int64>::max();

   }

   return ((us_ - kTimeTToMicrosecondsOffset) /

           kMicrosecondsPerMillisecond);

 }

 // static

 Time Time::UnixEpoch() {

   Time time;

   time.us_ = kTimeTToMicrosecondsOffset;

   return time;

 }

 Time Time::LocalMidnight() const {

   Exploded exploded;

   LocalExplode(&exploded);

   exploded.hour = 0;

   exploded.minute = 0;

   exploded.second = 0;

   exploded.millisecond = 0;

   return FromLocalExploded(exploded);

 }

 // static

 bool Time::FromStringInternal(const char* time_string,

                               bool is_local,

                               Time* parsed_time) {

   DCHECK((time_string != NULL) && (parsed_time != NULL));

   if (time_string[0] == '\0')

     return false;

   PRTime result_time = 0;

   PRStatus result = PR_ParseTimeString(time_string,

                                        is_local ? PR_FALSE : PR_TRUE,

                                        &result_time);

   if (PR_SUCCESS != result)

     return false;

   result_time += kTimeTToMicrosecondsOffset;

   *parsed_time = Time(result_time);

   return true;

 }

 // Time::Exploded -------------------------------------------------------------

 inline bool is_in_range(int value, int lo, int hi) {

   return lo <= value && value <= hi;

 }

 bool Time::Exploded::HasValidValues() const {

   return is_in_range(month, 1, 12) &&

          is_in_range(day_of_week, 0, 6) &&

          is_in_range(day_of_month, 1, 31) &&

          is_in_range(hour, 0, 23) &&

          is_in_range(minute, 0, 59) &&

          is_in_range(second, 0, 60) &&

          is_in_range(millisecond, 0, 999);

 }

 }  // namespace base