michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/time/time.h"
michael@0: 
michael@0: #include <limits>
michael@0: #include <ostream>
michael@0: 
michael@0: #include "base/float_util.h"
michael@0: #include "base/logging.h"
michael@0: #include "base/third_party/nspr/prtime.h"
michael@0: #include "base/third_party/nspr/prtypes.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: // TimeDelta ------------------------------------------------------------------
michael@0: 
michael@0: int TimeDelta::InDays() const {
michael@0:   return static_cast<int>(delta_ / Time::kMicrosecondsPerDay);
michael@0: }
michael@0: 
michael@0: int TimeDelta::InHours() const {
michael@0:   return static_cast<int>(delta_ / Time::kMicrosecondsPerHour);
michael@0: }
michael@0: 
michael@0: int TimeDelta::InMinutes() const {
michael@0:   return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute);
michael@0: }
michael@0: 
michael@0: double TimeDelta::InSecondsF() const {
michael@0:   return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond;
michael@0: }
michael@0: 
michael@0: int64 TimeDelta::InSeconds() const {
michael@0:   return delta_ / Time::kMicrosecondsPerSecond;
michael@0: }
michael@0: 
michael@0: double TimeDelta::InMillisecondsF() const {
michael@0:   return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;
michael@0: }
michael@0: 
michael@0: int64 TimeDelta::InMilliseconds() const {
michael@0:   return delta_ / Time::kMicrosecondsPerMillisecond;
michael@0: }
michael@0: 
michael@0: int64 TimeDelta::InMillisecondsRoundedUp() const {
michael@0:   return (delta_ + Time::kMicrosecondsPerMillisecond - 1) /
michael@0:       Time::kMicrosecondsPerMillisecond;
michael@0: }
michael@0: 
michael@0: int64 TimeDelta::InMicroseconds() const {
michael@0:   return delta_;
michael@0: }
michael@0: 
michael@0: // Time -----------------------------------------------------------------------
michael@0: 
michael@0: // static
michael@0: Time Time::Max() {
michael@0:   return Time(std::numeric_limits<int64>::max());
michael@0: }
michael@0: 
michael@0: // static
michael@0: Time Time::FromTimeT(time_t tt) {
michael@0:   if (tt == 0)
michael@0:     return Time();  // Preserve 0 so we can tell it doesn't exist.
michael@0:   if (tt == std::numeric_limits<time_t>::max())
michael@0:     return Max();
michael@0:   return Time((tt * kMicrosecondsPerSecond) + kTimeTToMicrosecondsOffset);
michael@0: }
michael@0: 
michael@0: time_t Time::ToTimeT() const {
michael@0:   if (is_null())
michael@0:     return 0;  // Preserve 0 so we can tell it doesn't exist.
michael@0:   if (is_max()) {
michael@0:     // Preserve max without offset to prevent overflow.
michael@0:     return std::numeric_limits<time_t>::max();
michael@0:   }
michael@0:   if (std::numeric_limits<int64>::max() - kTimeTToMicrosecondsOffset <= us_) {
michael@0:     DLOG(WARNING) << "Overflow when converting base::Time with internal " <<
michael@0:                      "value " << us_ << " to time_t.";
michael@0:     return std::numeric_limits<time_t>::max();
michael@0:   }
michael@0:   return (us_ - kTimeTToMicrosecondsOffset) / kMicrosecondsPerSecond;
michael@0: }
michael@0: 
michael@0: // static
michael@0: Time Time::FromDoubleT(double dt) {
michael@0:   if (dt == 0 || IsNaN(dt))
michael@0:     return Time();  // Preserve 0 so we can tell it doesn't exist.
michael@0:   if (dt == std::numeric_limits<double>::max())
michael@0:     return Max();
michael@0:   return Time(static_cast<int64>((dt *
michael@0:                                   static_cast<double>(kMicrosecondsPerSecond)) +
michael@0:                                  kTimeTToMicrosecondsOffset));
michael@0: }
michael@0: 
michael@0: double Time::ToDoubleT() const {
michael@0:   if (is_null())
michael@0:     return 0;  // Preserve 0 so we can tell it doesn't exist.
michael@0:   if (is_max()) {
michael@0:     // Preserve max without offset to prevent overflow.
michael@0:     return std::numeric_limits<double>::max();
michael@0:   }
michael@0:   return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
michael@0:           static_cast<double>(kMicrosecondsPerSecond));
michael@0: }
michael@0: 
michael@0: #if defined(OS_POSIX)
michael@0: // static
michael@0: Time Time::FromTimeSpec(const timespec& ts) {
michael@0:   return FromDoubleT(ts.tv_sec +
michael@0:                      static_cast<double>(ts.tv_nsec) /
michael@0:                          base::Time::kNanosecondsPerSecond);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: // static
michael@0: Time Time::FromJsTime(double ms_since_epoch) {
michael@0:   // The epoch is a valid time, so this constructor doesn't interpret
michael@0:   // 0 as the null time.
michael@0:   if (ms_since_epoch == std::numeric_limits<double>::max())
michael@0:     return Max();
michael@0:   return Time(static_cast<int64>(ms_since_epoch * kMicrosecondsPerMillisecond) +
michael@0:               kTimeTToMicrosecondsOffset);
michael@0: }
michael@0: 
michael@0: double Time::ToJsTime() const {
michael@0:   if (is_null()) {
michael@0:     // Preserve 0 so the invalid result doesn't depend on the platform.
michael@0:     return 0;
michael@0:   }
michael@0:   if (is_max()) {
michael@0:     // Preserve max without offset to prevent overflow.
michael@0:     return std::numeric_limits<double>::max();
michael@0:   }
michael@0:   return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
michael@0:           kMicrosecondsPerMillisecond);
michael@0: }
michael@0: 
michael@0: int64 Time::ToJavaTime() const {
michael@0:   if (is_null()) {
michael@0:     // Preserve 0 so the invalid result doesn't depend on the platform.
michael@0:     return 0;
michael@0:   }
michael@0:   if (is_max()) {
michael@0:     // Preserve max without offset to prevent overflow.
michael@0:     return std::numeric_limits<int64>::max();
michael@0:   }
michael@0:   return ((us_ - kTimeTToMicrosecondsOffset) /
michael@0:           kMicrosecondsPerMillisecond);
michael@0: }
michael@0: 
michael@0: // static
michael@0: Time Time::UnixEpoch() {
michael@0:   Time time;
michael@0:   time.us_ = kTimeTToMicrosecondsOffset;
michael@0:   return time;
michael@0: }
michael@0: 
michael@0: Time Time::LocalMidnight() const {
michael@0:   Exploded exploded;
michael@0:   LocalExplode(&exploded);
michael@0:   exploded.hour = 0;
michael@0:   exploded.minute = 0;
michael@0:   exploded.second = 0;
michael@0:   exploded.millisecond = 0;
michael@0:   return FromLocalExploded(exploded);
michael@0: }
michael@0: 
michael@0: // static
michael@0: bool Time::FromStringInternal(const char* time_string,
michael@0:                               bool is_local,
michael@0:                               Time* parsed_time) {
michael@0:   DCHECK((time_string != NULL) && (parsed_time != NULL));
michael@0: 
michael@0:   if (time_string[0] == '\0')
michael@0:     return false;
michael@0: 
michael@0:   PRTime result_time = 0;
michael@0:   PRStatus result = PR_ParseTimeString(time_string,
michael@0:                                        is_local ? PR_FALSE : PR_TRUE,
michael@0:                                        &result_time);
michael@0:   if (PR_SUCCESS != result)
michael@0:     return false;
michael@0: 
michael@0:   result_time += kTimeTToMicrosecondsOffset;
michael@0:   *parsed_time = Time(result_time);
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: // Time::Exploded -------------------------------------------------------------
michael@0: 
michael@0: inline bool is_in_range(int value, int lo, int hi) {
michael@0:   return lo <= value && value <= hi;
michael@0: }
michael@0: 
michael@0: bool Time::Exploded::HasValidValues() const {
michael@0:   return is_in_range(month, 1, 12) &&
michael@0:          is_in_range(day_of_week, 0, 6) &&
michael@0:          is_in_range(day_of_month, 1, 31) &&
michael@0:          is_in_range(hour, 0, 23) &&
michael@0:          is_in_range(minute, 0, 59) &&
michael@0:          is_in_range(second, 0, 60) &&
michael@0:          is_in_range(millisecond, 0, 999);
michael@0: }
michael@0: 
michael@0: }  // namespace base