base/time_unittest.cc - chromium/src - Git at Google

 // 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.h"

 #include <time.h>

 #include "base/compiler_specific.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"

 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;

 // Specialized test fixture allowing time strings without timezones to be
 // tested by comparing them to a known time in the local zone.
 // See also pr_time_unittests.cc
 class TimeTest : public testing::Test {
  protected:
   virtual void SetUp() OVERRIDE {
     // Use mktime to get a time_t, and turn it into a PRTime by converting
     // seconds to microseconds.  Use 15th Oct 2007 12:45:00 local.  This
     // must be a time guaranteed to be outside of a DST fallback hour in
     // any timezone.
     struct tm local_comparison_tm = {
       0,            // second
       45,           // minute
       12,           // hour
       15,           // day of month
       10 - 1,       // month
       2007 - 1900,  // year
       0,            // day of week (ignored, output only)
       0,            // day of year (ignored, output only)
       -1            // DST in effect, -1 tells mktime to figure it out
     };

     time_t converted_time = mktime(&local_comparison_tm);
     ASSERT_GT(converted_time, 0);
     comparison_time_local_ = Time::FromTimeT(converted_time);

     // time_t representation of 15th Oct 2007 12:45:00 PDT
     comparison_time_pdt_ = Time::FromTimeT(1192477500);
   }

   Time comparison_time_local_;
   Time comparison_time_pdt_;
 };

 // Test conversions to/from time_t and exploding/unexploding.
 TEST_F(TimeTest, TimeT) {
   // C library time and exploded time.
   time_t now_t_1 = time(NULL);
   struct tm tms;
 #if defined(OS_WIN)
   localtime_s(&tms, &now_t_1);
 #elif defined(OS_POSIX)
   localtime_r(&now_t_1, &tms);
 #endif

   // Convert to ours.
   Time our_time_1 = Time::FromTimeT(now_t_1);
   Time::Exploded exploded;
   our_time_1.LocalExplode(&exploded);

   // This will test both our exploding and our time_t -> Time conversion.
   EXPECT_EQ(tms.tm_year + 1900, exploded.year);
   EXPECT_EQ(tms.tm_mon + 1, exploded.month);
   EXPECT_EQ(tms.tm_mday, exploded.day_of_month);
   EXPECT_EQ(tms.tm_hour, exploded.hour);
   EXPECT_EQ(tms.tm_min, exploded.minute);
   EXPECT_EQ(tms.tm_sec, exploded.second);

   // Convert exploded back to the time struct.
   Time our_time_2 = Time::FromLocalExploded(exploded);
   EXPECT_TRUE(our_time_1 == our_time_2);

   time_t now_t_2 = our_time_2.ToTimeT();
   EXPECT_EQ(now_t_1, now_t_2);

   EXPECT_EQ(10, Time().FromTimeT(10).ToTimeT());
   EXPECT_EQ(10.0, Time().FromTimeT(10).ToDoubleT());

   // Conversions of 0 should stay 0.
   EXPECT_EQ(0, Time().ToTimeT());
   EXPECT_EQ(0, Time::FromTimeT(0).ToInternalValue());
 }

 TEST_F(TimeTest, FromExplodedWithMilliseconds) {
   // Some platform implementations of FromExploded are liable to drop
   // milliseconds if we aren't careful.
   Time now = Time::NowFromSystemTime();
   Time::Exploded exploded1 = {0};
   now.UTCExplode(&exploded1);
   exploded1.millisecond = 500;
   Time time = Time::FromUTCExploded(exploded1);
   Time::Exploded exploded2 = {0};
   time.UTCExplode(&exploded2);
   EXPECT_EQ(exploded1.millisecond, exploded2.millisecond);
 }

 TEST_F(TimeTest, ZeroIsSymmetric) {
   Time zero_time(Time::FromTimeT(0));
   EXPECT_EQ(0, zero_time.ToTimeT());

   EXPECT_EQ(0.0, zero_time.ToDoubleT());
 }

 TEST_F(TimeTest, LocalExplode) {
   Time a = Time::Now();
   Time::Exploded exploded;
   a.LocalExplode(&exploded);

   Time b = Time::FromLocalExploded(exploded);

   // The exploded structure doesn't have microseconds, and on Mac & Linux, the
   // internal OS conversion uses seconds, which will cause truncation. So we
   // can only make sure that the delta is within one second.
   EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
 }

 TEST_F(TimeTest, UTCExplode) {
   Time a = Time::Now();
   Time::Exploded exploded;
   a.UTCExplode(&exploded);

   Time b = Time::FromUTCExploded(exploded);
   EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
 }

 TEST_F(TimeTest, LocalMidnight) {
   Time::Exploded exploded;
   Time::Now().LocalMidnight().LocalExplode(&exploded);
   EXPECT_EQ(0, exploded.hour);
   EXPECT_EQ(0, exploded.minute);
   EXPECT_EQ(0, exploded.second);
   EXPECT_EQ(0, exploded.millisecond);
 }

 TEST_F(TimeTest, ParseTimeTest1) {
   time_t current_time = 0;
   time(&current_time);

   const int BUFFER_SIZE = 64;
   struct tm local_time = {0};
   char time_buf[BUFFER_SIZE] = {0};
 #if defined(OS_WIN)
   localtime_s(&local_time, &current_time);
   asctime_s(time_buf, arraysize(time_buf), &local_time);
 #elif defined(OS_POSIX)
   localtime_r(&current_time, &local_time);
   asctime_r(&local_time, time_buf);
 #endif

   Time parsed_time;
   EXPECT_TRUE(Time::FromString(time_buf, &parsed_time));
   EXPECT_EQ(current_time, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTest2) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("Mon, 15 Oct 2007 19:45:00 GMT", &parsed_time));
   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest3) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("15 Oct 07 12:45:00", &parsed_time));
   EXPECT_EQ(comparison_time_local_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest4) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("15 Oct 07 19:45 GMT", &parsed_time));
   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest5) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("Mon Oct 15 12:45 PDT 2007", &parsed_time));
   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest6) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("Monday, Oct 15, 2007 12:45 PM", &parsed_time));
   EXPECT_EQ(comparison_time_local_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest7) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("10/15/07 12:45:00 PM", &parsed_time));
   EXPECT_EQ(comparison_time_local_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest8) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("15-OCT-2007 12:45pm", &parsed_time));
   EXPECT_EQ(comparison_time_local_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest9) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("16 Oct 2007 4:45-JST (Tuesday)", &parsed_time));
   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 }

 TEST_F(TimeTest, ParseTimeTest10) {
   Time parsed_time;
   EXPECT_TRUE(Time::FromString("15/10/07 12:45", &parsed_time));
   EXPECT_EQ(parsed_time, comparison_time_local_);
 }

 // Test some of edge cases around epoch, etc.
 TEST_F(TimeTest, ParseTimeTestEpoch0) {
   Time parsed_time;

   // time_t == epoch == 0
   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:00 +0100 1970",
                                &parsed_time));
   EXPECT_EQ(0, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:00 GMT 1970",
                                &parsed_time));
   EXPECT_EQ(0, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTestEpoch1) {
   Time parsed_time;

   // time_t == 1 second after epoch == 1
   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:01 +0100 1970",
                                &parsed_time));
   EXPECT_EQ(1, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:01 GMT 1970",
                                &parsed_time));
   EXPECT_EQ(1, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTestEpoch2) {
   Time parsed_time;

   // time_t == 2 seconds after epoch == 2
   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:02 +0100 1970",
                                &parsed_time));
   EXPECT_EQ(2, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:02 GMT 1970",
                                &parsed_time));
   EXPECT_EQ(2, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTestEpochNeg1) {
   Time parsed_time;

   // time_t == 1 second before epoch == -1
   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:59 +0100 1970",
                                &parsed_time));
   EXPECT_EQ(-1, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 1969",
                                &parsed_time));
   EXPECT_EQ(-1, parsed_time.ToTimeT());
 }

 // If time_t is 32 bits, a date after year 2038 will overflow time_t and
 // cause timegm() to return -1.  The parsed time should not be 1 second
 // before epoch.
 TEST_F(TimeTest, ParseTimeTestEpochNotNeg1) {
   Time parsed_time;

   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 2100",
                                &parsed_time));
   EXPECT_NE(-1, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTestEpochNeg2) {
   Time parsed_time;

   // time_t == 2 seconds before epoch == -2
   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:58 +0100 1970",
                                &parsed_time));
   EXPECT_EQ(-2, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:58 GMT 1969",
                                &parsed_time));
   EXPECT_EQ(-2, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTestEpoch1960) {
   Time parsed_time;

   // time_t before Epoch, in 1960
   EXPECT_TRUE(Time::FromString("Wed Jun 29 19:40:01 +0100 1960",
                                &parsed_time));
   EXPECT_EQ(-299999999, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Wed Jun 29 18:40:01 GMT 1960",
                                &parsed_time));
   EXPECT_EQ(-299999999, parsed_time.ToTimeT());
   EXPECT_TRUE(Time::FromString("Wed Jun 29 17:40:01 GMT 1960",
                                &parsed_time));
   EXPECT_EQ(-300003599, parsed_time.ToTimeT());
 }

 TEST_F(TimeTest, ParseTimeTestEmpty) {
   Time parsed_time;
   EXPECT_FALSE(Time::FromString("", &parsed_time));
 }

 TEST_F(TimeTest, ParseTimeTestInvalidString) {
   Time parsed_time;
   EXPECT_FALSE(Time::FromString("Monday morning 2000", &parsed_time));
 }

 TEST_F(TimeTest, ExplodeBeforeUnixEpoch) {
   static const int kUnixEpochYear = 1970;  // In case this changes (ha!).
   Time t;
   Time::Exploded exploded;

   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1969-12-31 23:59:59 999 milliseconds (and 999 microseconds).
   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
   EXPECT_EQ(12, exploded.month);
   EXPECT_EQ(31, exploded.day_of_month);
   EXPECT_EQ(23, exploded.hour);
   EXPECT_EQ(59, exploded.minute);
   EXPECT_EQ(59, exploded.second);
   EXPECT_EQ(999, exploded.millisecond);

   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1000);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1969-12-31 23:59:59 999 milliseconds.
   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
   EXPECT_EQ(12, exploded.month);
   EXPECT_EQ(31, exploded.day_of_month);
   EXPECT_EQ(23, exploded.hour);
   EXPECT_EQ(59, exploded.minute);
   EXPECT_EQ(59, exploded.second);
   EXPECT_EQ(999, exploded.millisecond);

   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1001);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1969-12-31 23:59:59 998 milliseconds (and 999 microseconds).
   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
   EXPECT_EQ(12, exploded.month);
   EXPECT_EQ(31, exploded.day_of_month);
   EXPECT_EQ(23, exploded.hour);
   EXPECT_EQ(59, exploded.minute);
   EXPECT_EQ(59, exploded.second);
   EXPECT_EQ(998, exploded.millisecond);

   t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1000);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1969-12-31 23:59:59.
   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
   EXPECT_EQ(12, exploded.month);
   EXPECT_EQ(31, exploded.day_of_month);
   EXPECT_EQ(23, exploded.hour);
   EXPECT_EQ(59, exploded.minute);
   EXPECT_EQ(59, exploded.second);
   EXPECT_EQ(0, exploded.millisecond);

   t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1001);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1969-12-31 23:59:58 999 milliseconds.
   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
   EXPECT_EQ(12, exploded.month);
   EXPECT_EQ(31, exploded.day_of_month);
   EXPECT_EQ(23, exploded.hour);
   EXPECT_EQ(59, exploded.minute);
   EXPECT_EQ(58, exploded.second);
   EXPECT_EQ(999, exploded.millisecond);

   // Make sure we still handle at/after Unix epoch correctly.
   t = Time::UnixEpoch();
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1970-12-31 00:00:00 0 milliseconds.
   EXPECT_EQ(kUnixEpochYear, exploded.year);
   EXPECT_EQ(1, exploded.month);
   EXPECT_EQ(1, exploded.day_of_month);
   EXPECT_EQ(0, exploded.hour);
   EXPECT_EQ(0, exploded.minute);
   EXPECT_EQ(0, exploded.second);
   EXPECT_EQ(0, exploded.millisecond);

   t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1970-01-01 00:00:00 0 milliseconds (and 1 microsecond).
   EXPECT_EQ(kUnixEpochYear, exploded.year);
   EXPECT_EQ(1, exploded.month);
   EXPECT_EQ(1, exploded.day_of_month);
   EXPECT_EQ(0, exploded.hour);
   EXPECT_EQ(0, exploded.minute);
   EXPECT_EQ(0, exploded.second);
   EXPECT_EQ(0, exploded.millisecond);

   t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1000);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1970-01-01 00:00:00 1 millisecond.
   EXPECT_EQ(kUnixEpochYear, exploded.year);
   EXPECT_EQ(1, exploded.month);
   EXPECT_EQ(1, exploded.day_of_month);
   EXPECT_EQ(0, exploded.hour);
   EXPECT_EQ(0, exploded.minute);
   EXPECT_EQ(0, exploded.second);
   EXPECT_EQ(1, exploded.millisecond);

   t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1000);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1970-01-01 00:00:01.
   EXPECT_EQ(kUnixEpochYear, exploded.year);
   EXPECT_EQ(1, exploded.month);
   EXPECT_EQ(1, exploded.day_of_month);
   EXPECT_EQ(0, exploded.hour);
   EXPECT_EQ(0, exploded.minute);
   EXPECT_EQ(1, exploded.second);
   EXPECT_EQ(0, exploded.millisecond);

   t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1001);
   t.UTCExplode(&exploded);
   EXPECT_TRUE(exploded.HasValidValues());
   // Should be 1970-01-01 00:00:01 1 millisecond.
   EXPECT_EQ(kUnixEpochYear, exploded.year);
   EXPECT_EQ(1, exploded.month);
   EXPECT_EQ(1, exploded.day_of_month);
   EXPECT_EQ(0, exploded.hour);
   EXPECT_EQ(0, exploded.minute);
   EXPECT_EQ(1, exploded.second);
   EXPECT_EQ(1, exploded.millisecond);
 }

 TEST(TimeTicks, Deltas) {
   for (int index = 0; index < 50; index++) {
     TimeTicks ticks_start = TimeTicks::Now();
     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
     TimeTicks ticks_stop = TimeTicks::Now();
     TimeDelta delta = ticks_stop - ticks_start;
     // Note:  Although we asked for a 10ms sleep, if the
     // time clock has a finer granularity than the Sleep()
     // clock, it is quite possible to wakeup early.  Here
     // is how that works:
     //      Time(ms timer)      Time(us timer)
     //          5                   5010
     //          6                   6010
     //          7                   7010
     //          8                   8010
     //          9                   9000
     // Elapsed  4ms                 3990us
     //
     // Unfortunately, our InMilliseconds() function truncates
     // rather than rounds.  We should consider fixing this
     // so that our averages come out better.
     EXPECT_GE(delta.InMilliseconds(), 9);
     EXPECT_GE(delta.InMicroseconds(), 9000);
     EXPECT_EQ(delta.InSeconds(), 0);
   }
 }

 static void HighResClockTest(TimeTicks (*GetTicks)()) {
 #if defined(OS_WIN)
   // HighResNow doesn't work on some systems.  Since the product still works
   // even if it doesn't work, it makes this entire test questionable.
   if (!TimeTicks::IsHighResClockWorking())
     return;
 #endif

   // Why do we loop here?
   // We're trying to measure that intervals increment in a VERY small amount
   // of time --  less than 15ms.  Unfortunately, if we happen to have a
   // context switch in the middle of our test, the context switch could easily
   // exceed our limit.  So, we iterate on this several times.  As long as we're
   // able to detect the fine-granularity timers at least once, then the test
   // has succeeded.

   const int kTargetGranularityUs = 15000;  // 15ms

   bool success = false;
   int retries = 100;  // Arbitrary.
   TimeDelta delta;
   while (!success && retries--) {
     TimeTicks ticks_start = GetTicks();
     // Loop until we can detect that the clock has changed.  Non-HighRes timers
     // will increment in chunks, e.g. 15ms.  By spinning until we see a clock
     // change, we detect the minimum time between measurements.
     do {
       delta = GetTicks() - ticks_start;
     } while (delta.InMilliseconds() == 0);

     if (delta.InMicroseconds() <= kTargetGranularityUs)
       success = true;
   }

   // In high resolution mode, we expect to see the clock increment
   // in intervals less than 15ms.
   EXPECT_TRUE(success);
 }

 TEST(TimeTicks, HighResNow) {
   HighResClockTest(&TimeTicks::HighResNow);
 }

 TEST(TimeTicks, NowFromSystemTraceTime) {
   // Re-use HighResNow test for now since clock properties are identical.
   HighResClockTest(&TimeTicks::NowFromSystemTraceTime);
 }

 TEST(TimeDelta, FromAndIn) {
   EXPECT_TRUE(TimeDelta::FromDays(2) == TimeDelta::FromHours(48));
   EXPECT_TRUE(TimeDelta::FromHours(3) == TimeDelta::FromMinutes(180));
   EXPECT_TRUE(TimeDelta::FromMinutes(2) == TimeDelta::FromSeconds(120));
   EXPECT_TRUE(TimeDelta::FromSeconds(2) == TimeDelta::FromMilliseconds(2000));
   EXPECT_TRUE(TimeDelta::FromMilliseconds(2) ==
               TimeDelta::FromMicroseconds(2000));
   EXPECT_EQ(13, TimeDelta::FromDays(13).InDays());
   EXPECT_EQ(13, TimeDelta::FromHours(13).InHours());
   EXPECT_EQ(13, TimeDelta::FromMinutes(13).InMinutes());
   EXPECT_EQ(13, TimeDelta::FromSeconds(13).InSeconds());
   EXPECT_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
   EXPECT_EQ(13, TimeDelta::FromMilliseconds(13).InMilliseconds());
   EXPECT_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
   EXPECT_EQ(13, TimeDelta::FromMicroseconds(13).InMicroseconds());
 }

 #if defined(OS_POSIX)
 TEST(TimeDelta, TimeSpecConversion) {
   struct timespec result = TimeDelta::FromSeconds(0).ToTimeSpec();
   EXPECT_EQ(result.tv_sec, 0);
   EXPECT_EQ(result.tv_nsec, 0);

   result = TimeDelta::FromSeconds(1).ToTimeSpec();
   EXPECT_EQ(result.tv_sec, 1);
   EXPECT_EQ(result.tv_nsec, 0);

   result = TimeDelta::FromMicroseconds(1).ToTimeSpec();
   EXPECT_EQ(result.tv_sec, 0);
   EXPECT_EQ(result.tv_nsec, 1000);

   result = TimeDelta::FromMicroseconds(
       Time::kMicrosecondsPerSecond + 1).ToTimeSpec();
   EXPECT_EQ(result.tv_sec, 1);
   EXPECT_EQ(result.tv_nsec, 1000);
 }
 #endif  // OS_POSIX

 // Our internal time format is serialized in things like databases, so it's
 // important that it's consistent across all our platforms.  We use the 1601
 // Windows epoch as the internal format across all platforms.
 TEST(TimeDelta, WindowsEpoch) {
   Time::Exploded exploded;
   exploded.year = 1970;
   exploded.month = 1;
   exploded.day_of_week = 0;  // Should be unusued.
   exploded.day_of_month = 1;
   exploded.hour = 0;
   exploded.minute = 0;
   exploded.second = 0;
   exploded.millisecond = 0;
   Time t = Time::FromUTCExploded(exploded);
   // Unix 1970 epoch.
   EXPECT_EQ(GG_INT64_C(11644473600000000), t.ToInternalValue());

   // We can't test 1601 epoch, since the system time functions on Linux
   // only compute years starting from 1900.
 }
	// 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.h"

	#include <time.h>

	#include "base/compiler_specific.h"
	#include "base/threading/platform_thread.h"
	#include "build/build_config.h"
	#include "testing/gtest/include/gtest/gtest.h"

	using base::Time;
	using base::TimeDelta;
	using base::TimeTicks;

	// Specialized test fixture allowing time strings without timezones to be
	// tested by comparing them to a known time in the local zone.
	// See also pr_time_unittests.cc
	class TimeTest : public testing::Test {
	protected:
	virtual void SetUp() OVERRIDE {
	// Use mktime to get a time_t, and turn it into a PRTime by converting
	// seconds to microseconds. Use 15th Oct 2007 12:45:00 local. This
	// must be a time guaranteed to be outside of a DST fallback hour in
	// any timezone.
	struct tm local_comparison_tm = {
	0, // second
	45, // minute
	12, // hour
	15, // day of month
	10 - 1, // month
	2007 - 1900, // year
	0, // day of week (ignored, output only)
	0, // day of year (ignored, output only)
	-1 // DST in effect, -1 tells mktime to figure it out
	};

	time_t converted_time = mktime(&local_comparison_tm);
	ASSERT_GT(converted_time, 0);
	comparison_time_local_ = Time::FromTimeT(converted_time);

	// time_t representation of 15th Oct 2007 12:45:00 PDT
	comparison_time_pdt_ = Time::FromTimeT(1192477500);
	}

	Time comparison_time_local_;
	Time comparison_time_pdt_;
	};

	// Test conversions to/from time_t and exploding/unexploding.
	TEST_F(TimeTest, TimeT) {
	// C library time and exploded time.
	time_t now_t_1 = time(NULL);
	struct tm tms;
	#if defined(OS_WIN)
	localtime_s(&tms, &now_t_1);
	#elif defined(OS_POSIX)
	localtime_r(&now_t_1, &tms);
	#endif

	// Convert to ours.
	Time our_time_1 = Time::FromTimeT(now_t_1);
	Time::Exploded exploded;
	our_time_1.LocalExplode(&exploded);

	// This will test both our exploding and our time_t -> Time conversion.
	EXPECT_EQ(tms.tm_year + 1900, exploded.year);
	EXPECT_EQ(tms.tm_mon + 1, exploded.month);
	EXPECT_EQ(tms.tm_mday, exploded.day_of_month);
	EXPECT_EQ(tms.tm_hour, exploded.hour);
	EXPECT_EQ(tms.tm_min, exploded.minute);
	EXPECT_EQ(tms.tm_sec, exploded.second);

	// Convert exploded back to the time struct.
	Time our_time_2 = Time::FromLocalExploded(exploded);
	EXPECT_TRUE(our_time_1 == our_time_2);

	time_t now_t_2 = our_time_2.ToTimeT();
	EXPECT_EQ(now_t_1, now_t_2);

	EXPECT_EQ(10, Time().FromTimeT(10).ToTimeT());
	EXPECT_EQ(10.0, Time().FromTimeT(10).ToDoubleT());

	// Conversions of 0 should stay 0.
	EXPECT_EQ(0, Time().ToTimeT());
	EXPECT_EQ(0, Time::FromTimeT(0).ToInternalValue());
	}

	TEST_F(TimeTest, FromExplodedWithMilliseconds) {
	// Some platform implementations of FromExploded are liable to drop
	// milliseconds if we aren't careful.
	Time now = Time::NowFromSystemTime();
	Time::Exploded exploded1 = {0};
	now.UTCExplode(&exploded1);
	exploded1.millisecond = 500;
	Time time = Time::FromUTCExploded(exploded1);
	Time::Exploded exploded2 = {0};
	time.UTCExplode(&exploded2);
	EXPECT_EQ(exploded1.millisecond, exploded2.millisecond);
	}

	TEST_F(TimeTest, ZeroIsSymmetric) {
	Time zero_time(Time::FromTimeT(0));
	EXPECT_EQ(0, zero_time.ToTimeT());

	EXPECT_EQ(0.0, zero_time.ToDoubleT());
	}

	TEST_F(TimeTest, LocalExplode) {
	Time a = Time::Now();
	Time::Exploded exploded;
	a.LocalExplode(&exploded);

	Time b = Time::FromLocalExploded(exploded);

	// The exploded structure doesn't have microseconds, and on Mac & Linux, the
	// internal OS conversion uses seconds, which will cause truncation. So we
	// can only make sure that the delta is within one second.
	EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
	}

	TEST_F(TimeTest, UTCExplode) {
	Time a = Time::Now();
	Time::Exploded exploded;
	a.UTCExplode(&exploded);

	Time b = Time::FromUTCExploded(exploded);
	EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
	}

	TEST_F(TimeTest, LocalMidnight) {
	Time::Exploded exploded;
	Time::Now().LocalMidnight().LocalExplode(&exploded);
	EXPECT_EQ(0, exploded.hour);
	EXPECT_EQ(0, exploded.minute);
	EXPECT_EQ(0, exploded.second);
	EXPECT_EQ(0, exploded.millisecond);
	}

	TEST_F(TimeTest, ParseTimeTest1) {
	time_t current_time = 0;
	time(&current_time);

	const int BUFFER_SIZE = 64;
	struct tm local_time = {0};
	char time_buf[BUFFER_SIZE] = {0};
	#if defined(OS_WIN)
	localtime_s(&local_time, &current_time);
	asctime_s(time_buf, arraysize(time_buf), &local_time);
	#elif defined(OS_POSIX)
	localtime_r(&current_time, &local_time);
	asctime_r(&local_time, time_buf);
	#endif

	Time parsed_time;
	EXPECT_TRUE(Time::FromString(time_buf, &parsed_time));
	EXPECT_EQ(current_time, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTest2) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("Mon, 15 Oct 2007 19:45:00 GMT", &parsed_time));
	EXPECT_EQ(comparison_time_pdt_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest3) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("15 Oct 07 12:45:00", &parsed_time));
	EXPECT_EQ(comparison_time_local_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest4) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("15 Oct 07 19:45 GMT", &parsed_time));
	EXPECT_EQ(comparison_time_pdt_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest5) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("Mon Oct 15 12:45 PDT 2007", &parsed_time));
	EXPECT_EQ(comparison_time_pdt_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest6) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("Monday, Oct 15, 2007 12:45 PM", &parsed_time));
	EXPECT_EQ(comparison_time_local_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest7) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("10/15/07 12:45:00 PM", &parsed_time));
	EXPECT_EQ(comparison_time_local_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest8) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("15-OCT-2007 12:45pm", &parsed_time));
	EXPECT_EQ(comparison_time_local_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest9) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("16 Oct 2007 4:45-JST (Tuesday)", &parsed_time));
	EXPECT_EQ(comparison_time_pdt_, parsed_time);
	}

	TEST_F(TimeTest, ParseTimeTest10) {
	Time parsed_time;
	EXPECT_TRUE(Time::FromString("15/10/07 12:45", &parsed_time));
	EXPECT_EQ(parsed_time, comparison_time_local_);
	}

	// Test some of edge cases around epoch, etc.
	TEST_F(TimeTest, ParseTimeTestEpoch0) {
	Time parsed_time;

	// time_t == epoch == 0
	EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:00 +0100 1970",
	&parsed_time));
	EXPECT_EQ(0, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:00 GMT 1970",
	&parsed_time));
	EXPECT_EQ(0, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTestEpoch1) {
	Time parsed_time;

	// time_t == 1 second after epoch == 1
	EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:01 +0100 1970",
	&parsed_time));
	EXPECT_EQ(1, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:01 GMT 1970",
	&parsed_time));
	EXPECT_EQ(1, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTestEpoch2) {
	Time parsed_time;

	// time_t == 2 seconds after epoch == 2
	EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:02 +0100 1970",
	&parsed_time));
	EXPECT_EQ(2, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:02 GMT 1970",
	&parsed_time));
	EXPECT_EQ(2, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTestEpochNeg1) {
	Time parsed_time;

	// time_t == 1 second before epoch == -1
	EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:59 +0100 1970",
	&parsed_time));
	EXPECT_EQ(-1, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 1969",
	&parsed_time));
	EXPECT_EQ(-1, parsed_time.ToTimeT());
	}

	// If time_t is 32 bits, a date after year 2038 will overflow time_t and
	// cause timegm() to return -1. The parsed time should not be 1 second
	// before epoch.
	TEST_F(TimeTest, ParseTimeTestEpochNotNeg1) {
	Time parsed_time;

	EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 2100",
	&parsed_time));
	EXPECT_NE(-1, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTestEpochNeg2) {
	Time parsed_time;

	// time_t == 2 seconds before epoch == -2
	EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:58 +0100 1970",
	&parsed_time));
	EXPECT_EQ(-2, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:58 GMT 1969",
	&parsed_time));
	EXPECT_EQ(-2, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTestEpoch1960) {
	Time parsed_time;

	// time_t before Epoch, in 1960
	EXPECT_TRUE(Time::FromString("Wed Jun 29 19:40:01 +0100 1960",
	&parsed_time));
	EXPECT_EQ(-299999999, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Wed Jun 29 18:40:01 GMT 1960",
	&parsed_time));
	EXPECT_EQ(-299999999, parsed_time.ToTimeT());
	EXPECT_TRUE(Time::FromString("Wed Jun 29 17:40:01 GMT 1960",
	&parsed_time));
	EXPECT_EQ(-300003599, parsed_time.ToTimeT());
	}

	TEST_F(TimeTest, ParseTimeTestEmpty) {
	Time parsed_time;
	EXPECT_FALSE(Time::FromString("", &parsed_time));
	}

	TEST_F(TimeTest, ParseTimeTestInvalidString) {
	Time parsed_time;
	EXPECT_FALSE(Time::FromString("Monday morning 2000", &parsed_time));
	}

	TEST_F(TimeTest, ExplodeBeforeUnixEpoch) {
	static const int kUnixEpochYear = 1970; // In case this changes (ha!).
	Time t;
	Time::Exploded exploded;

	t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1969-12-31 23:59:59 999 milliseconds (and 999 microseconds).
	EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
	EXPECT_EQ(12, exploded.month);
	EXPECT_EQ(31, exploded.day_of_month);
	EXPECT_EQ(23, exploded.hour);
	EXPECT_EQ(59, exploded.minute);
	EXPECT_EQ(59, exploded.second);
	EXPECT_EQ(999, exploded.millisecond);

	t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1000);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1969-12-31 23:59:59 999 milliseconds.
	EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
	EXPECT_EQ(12, exploded.month);
	EXPECT_EQ(31, exploded.day_of_month);
	EXPECT_EQ(23, exploded.hour);
	EXPECT_EQ(59, exploded.minute);
	EXPECT_EQ(59, exploded.second);
	EXPECT_EQ(999, exploded.millisecond);

	t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1001);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1969-12-31 23:59:59 998 milliseconds (and 999 microseconds).
	EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
	EXPECT_EQ(12, exploded.month);
	EXPECT_EQ(31, exploded.day_of_month);
	EXPECT_EQ(23, exploded.hour);
	EXPECT_EQ(59, exploded.minute);
	EXPECT_EQ(59, exploded.second);
	EXPECT_EQ(998, exploded.millisecond);

	t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1000);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1969-12-31 23:59:59.
	EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
	EXPECT_EQ(12, exploded.month);
	EXPECT_EQ(31, exploded.day_of_month);
	EXPECT_EQ(23, exploded.hour);
	EXPECT_EQ(59, exploded.minute);
	EXPECT_EQ(59, exploded.second);
	EXPECT_EQ(0, exploded.millisecond);

	t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1001);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1969-12-31 23:59:58 999 milliseconds.
	EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
	EXPECT_EQ(12, exploded.month);
	EXPECT_EQ(31, exploded.day_of_month);
	EXPECT_EQ(23, exploded.hour);
	EXPECT_EQ(59, exploded.minute);
	EXPECT_EQ(58, exploded.second);
	EXPECT_EQ(999, exploded.millisecond);

	// Make sure we still handle at/after Unix epoch correctly.
	t = Time::UnixEpoch();
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1970-12-31 00:00:00 0 milliseconds.
	EXPECT_EQ(kUnixEpochYear, exploded.year);
	EXPECT_EQ(1, exploded.month);
	EXPECT_EQ(1, exploded.day_of_month);
	EXPECT_EQ(0, exploded.hour);
	EXPECT_EQ(0, exploded.minute);
	EXPECT_EQ(0, exploded.second);
	EXPECT_EQ(0, exploded.millisecond);

	t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1970-01-01 00:00:00 0 milliseconds (and 1 microsecond).
	EXPECT_EQ(kUnixEpochYear, exploded.year);
	EXPECT_EQ(1, exploded.month);
	EXPECT_EQ(1, exploded.day_of_month);
	EXPECT_EQ(0, exploded.hour);
	EXPECT_EQ(0, exploded.minute);
	EXPECT_EQ(0, exploded.second);
	EXPECT_EQ(0, exploded.millisecond);

	t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1000);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1970-01-01 00:00:00 1 millisecond.
	EXPECT_EQ(kUnixEpochYear, exploded.year);
	EXPECT_EQ(1, exploded.month);
	EXPECT_EQ(1, exploded.day_of_month);
	EXPECT_EQ(0, exploded.hour);
	EXPECT_EQ(0, exploded.minute);
	EXPECT_EQ(0, exploded.second);
	EXPECT_EQ(1, exploded.millisecond);

	t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1000);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1970-01-01 00:00:01.
	EXPECT_EQ(kUnixEpochYear, exploded.year);
	EXPECT_EQ(1, exploded.month);
	EXPECT_EQ(1, exploded.day_of_month);
	EXPECT_EQ(0, exploded.hour);
	EXPECT_EQ(0, exploded.minute);
	EXPECT_EQ(1, exploded.second);
	EXPECT_EQ(0, exploded.millisecond);

	t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1001);
	t.UTCExplode(&exploded);
	EXPECT_TRUE(exploded.HasValidValues());
	// Should be 1970-01-01 00:00:01 1 millisecond.
	EXPECT_EQ(kUnixEpochYear, exploded.year);
	EXPECT_EQ(1, exploded.month);
	EXPECT_EQ(1, exploded.day_of_month);
	EXPECT_EQ(0, exploded.hour);
	EXPECT_EQ(0, exploded.minute);
	EXPECT_EQ(1, exploded.second);
	EXPECT_EQ(1, exploded.millisecond);
	}

	TEST(TimeTicks, Deltas) {
	for (int index = 0; index < 50; index++) {
	TimeTicks ticks_start = TimeTicks::Now();
	base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
	TimeTicks ticks_stop = TimeTicks::Now();
	TimeDelta delta = ticks_stop - ticks_start;
	// Note: Although we asked for a 10ms sleep, if the
	// time clock has a finer granularity than the Sleep()
	// clock, it is quite possible to wakeup early. Here
	// is how that works:
	// Time(ms timer) Time(us timer)
	// 5 5010
	// 6 6010
	// 7 7010
	// 8 8010
	// 9 9000
	// Elapsed 4ms 3990us
	//
	// Unfortunately, our InMilliseconds() function truncates
	// rather than rounds. We should consider fixing this
	// so that our averages come out better.
	EXPECT_GE(delta.InMilliseconds(), 9);
	EXPECT_GE(delta.InMicroseconds(), 9000);
	EXPECT_EQ(delta.InSeconds(), 0);
	}
	}

	static void HighResClockTest(TimeTicks (*GetTicks)()) {
	#if defined(OS_WIN)
	// HighResNow doesn't work on some systems. Since the product still works
	// even if it doesn't work, it makes this entire test questionable.
	if (!TimeTicks::IsHighResClockWorking())
	return;
	#endif

	// Why do we loop here?
	// We're trying to measure that intervals increment in a VERY small amount
	// of time -- less than 15ms. Unfortunately, if we happen to have a
	// context switch in the middle of our test, the context switch could easily
	// exceed our limit. So, we iterate on this several times. As long as we're
	// able to detect the fine-granularity timers at least once, then the test
	// has succeeded.

	const int kTargetGranularityUs = 15000; // 15ms

	bool success = false;
	int retries = 100; // Arbitrary.
	TimeDelta delta;
	while (!success && retries--) {
	TimeTicks ticks_start = GetTicks();
	// Loop until we can detect that the clock has changed. Non-HighRes timers
	// will increment in chunks, e.g. 15ms. By spinning until we see a clock
	// change, we detect the minimum time between measurements.
	do {
	delta = GetTicks() - ticks_start;
	} while (delta.InMilliseconds() == 0);

	if (delta.InMicroseconds() <= kTargetGranularityUs)
	success = true;
	}

	// In high resolution mode, we expect to see the clock increment
	// in intervals less than 15ms.
	EXPECT_TRUE(success);
	}

	TEST(TimeTicks, HighResNow) {
	HighResClockTest(&TimeTicks::HighResNow);
	}

	TEST(TimeTicks, NowFromSystemTraceTime) {
	// Re-use HighResNow test for now since clock properties are identical.
	HighResClockTest(&TimeTicks::NowFromSystemTraceTime);
	}

	TEST(TimeDelta, FromAndIn) {
	EXPECT_TRUE(TimeDelta::FromDays(2) == TimeDelta::FromHours(48));
	EXPECT_TRUE(TimeDelta::FromHours(3) == TimeDelta::FromMinutes(180));
	EXPECT_TRUE(TimeDelta::FromMinutes(2) == TimeDelta::FromSeconds(120));
	EXPECT_TRUE(TimeDelta::FromSeconds(2) == TimeDelta::FromMilliseconds(2000));
	EXPECT_TRUE(TimeDelta::FromMilliseconds(2) ==
	TimeDelta::FromMicroseconds(2000));
	EXPECT_EQ(13, TimeDelta::FromDays(13).InDays());
	EXPECT_EQ(13, TimeDelta::FromHours(13).InHours());
	EXPECT_EQ(13, TimeDelta::FromMinutes(13).InMinutes());
	EXPECT_EQ(13, TimeDelta::FromSeconds(13).InSeconds());
	EXPECT_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
	EXPECT_EQ(13, TimeDelta::FromMilliseconds(13).InMilliseconds());
	EXPECT_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
	EXPECT_EQ(13, TimeDelta::FromMicroseconds(13).InMicroseconds());
	}

	#if defined(OS_POSIX)
	TEST(TimeDelta, TimeSpecConversion) {
	struct timespec result = TimeDelta::FromSeconds(0).ToTimeSpec();
	EXPECT_EQ(result.tv_sec, 0);
	EXPECT_EQ(result.tv_nsec, 0);

	result = TimeDelta::FromSeconds(1).ToTimeSpec();
	EXPECT_EQ(result.tv_sec, 1);
	EXPECT_EQ(result.tv_nsec, 0);

	result = TimeDelta::FromMicroseconds(1).ToTimeSpec();
	EXPECT_EQ(result.tv_sec, 0);
	EXPECT_EQ(result.tv_nsec, 1000);

	result = TimeDelta::FromMicroseconds(
	Time::kMicrosecondsPerSecond + 1).ToTimeSpec();
	EXPECT_EQ(result.tv_sec, 1);
	EXPECT_EQ(result.tv_nsec, 1000);
	}
	#endif // OS_POSIX

	// Our internal time format is serialized in things like databases, so it's
	// important that it's consistent across all our platforms. We use the 1601
	// Windows epoch as the internal format across all platforms.
	TEST(TimeDelta, WindowsEpoch) {
	Time::Exploded exploded;
	exploded.year = 1970;
	exploded.month = 1;
	exploded.day_of_week = 0; // Should be unusued.
	exploded.day_of_month = 1;
	exploded.hour = 0;
	exploded.minute = 0;
	exploded.second = 0;
	exploded.millisecond = 0;
	Time t = Time::FromUTCExploded(exploded);
	// Unix 1970 epoch.
	EXPECT_EQ(GG_INT64_C(11644473600000000), t.ToInternalValue());

	// We can't test 1601 epoch, since the system time functions on Linux
	// only compute years starting from 1900.
	}