base/time_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/time.h"
   6
   7 #include <time.h>
   8
   9 #include "base/compiler_specific.h"
  10 #include "base/threading/platform_thread.h"
  11 #include "build/build_config.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 using base::Time;
  15 using base::TimeDelta;
  16 using base::TimeTicks;
  17
  18 // Specialized test fixture allowing time strings without timezones to be
  19 // tested by comparing them to a known time in the local zone.
  20 // See also pr_time_unittests.cc
  21 class TimeTest : public testing::Test {
  22  protected:
  23   virtual void SetUp() OVERRIDE {
  24     // Use mktime to get a time_t, and turn it into a PRTime by converting
  25     // seconds to microseconds.  Use 15th Oct 2007 12:45:00 local.  This
  26     // must be a time guaranteed to be outside of a DST fallback hour in
  27     // any timezone.
  28     struct tm local_comparison_tm = {
  29       0,            // second
  30       45,           // minute
  31       12,           // hour
  32       15,           // day of month
  33       10 - 1,       // month
  34       2007 - 1900,  // year
  35       0,            // day of week (ignored, output only)
  36       0,            // day of year (ignored, output only)
  37       -1            // DST in effect, -1 tells mktime to figure it out
  38     };
  39
  40     time_t converted_time = mktime(&local_comparison_tm);
  41     ASSERT_GT(converted_time, 0);
  42     comparison_time_local_ = Time::FromTimeT(converted_time);
  43
  44     // time_t representation of 15th Oct 2007 12:45:00 PDT
  45     comparison_time_pdt_ = Time::FromTimeT(1192477500);
  46   }
  47
  48   Time comparison_time_local_;
  49   Time comparison_time_pdt_;
  50 };
  51
  52 // Test conversions to/from time_t and exploding/unexploding.
  53 TEST_F(TimeTest, TimeT) {
  54   // C library time and exploded time.
  55   time_t now_t_1 = time(NULL);
  56   struct tm tms;
  57 #if defined(OS_WIN)
  58   localtime_s(&tms, &now_t_1);
  59 #elif defined(OS_POSIX)
  60   localtime_r(&now_t_1, &tms);
  61 #endif
  62
  63   // Convert to ours.
  64   Time our_time_1 = Time::FromTimeT(now_t_1);
  65   Time::Exploded exploded;
  66   our_time_1.LocalExplode(&exploded);
  67
  68   // This will test both our exploding and our time_t -> Time conversion.
  69   EXPECT_EQ(tms.tm_year + 1900, exploded.year);
  70   EXPECT_EQ(tms.tm_mon + 1, exploded.month);
  71   EXPECT_EQ(tms.tm_mday, exploded.day_of_month);
  72   EXPECT_EQ(tms.tm_hour, exploded.hour);
  73   EXPECT_EQ(tms.tm_min, exploded.minute);
  74   EXPECT_EQ(tms.tm_sec, exploded.second);
  75
  76   // Convert exploded back to the time struct.
  77   Time our_time_2 = Time::FromLocalExploded(exploded);
  78   EXPECT_TRUE(our_time_1 == our_time_2);
  79
  80   time_t now_t_2 = our_time_2.ToTimeT();
  81   EXPECT_EQ(now_t_1, now_t_2);
  82
  83   EXPECT_EQ(10, Time().FromTimeT(10).ToTimeT());
  84   EXPECT_EQ(10.0, Time().FromTimeT(10).ToDoubleT());
  85
  86   // Conversions of 0 should stay 0.
  87   EXPECT_EQ(0, Time().ToTimeT());
  88   EXPECT_EQ(0, Time::FromTimeT(0).ToInternalValue());
  89 }
  90
  91 // Test conversions to/from javascript time.
  92 TEST_F(TimeTest, JsTime) {
  93   Time epoch = Time::FromJsTime(0.0);
  94   EXPECT_EQ(epoch, Time::UnixEpoch());
  95   Time t = Time::FromJsTime(700000.3);
  96   EXPECT_EQ(700.0003, t.ToDoubleT());
  97   t = Time::FromDoubleT(800.73);
  98   EXPECT_EQ(800730.0, t.ToJsTime());
  99 }
 100
 101 #if defined(OS_POSIX)
 102 TEST_F(TimeTest, FromTimeVal) {
 103   Time now = Time::Now();
 104   Time also_now = Time::FromTimeVal(now.ToTimeVal());
 105   EXPECT_EQ(now, also_now);
 106 }
 107 #endif  // OS_POSIX
 108
 109 TEST_F(TimeTest, FromExplodedWithMilliseconds) {
 110   // Some platform implementations of FromExploded are liable to drop
 111   // milliseconds if we aren't careful.
 112   Time now = Time::NowFromSystemTime();
 113   Time::Exploded exploded1 = {0};
 114   now.UTCExplode(&exploded1);
 115   exploded1.millisecond = 500;
 116   Time time = Time::FromUTCExploded(exploded1);
 117   Time::Exploded exploded2 = {0};
 118   time.UTCExplode(&exploded2);
 119   EXPECT_EQ(exploded1.millisecond, exploded2.millisecond);
 120 }
 121
 122 TEST_F(TimeTest, ZeroIsSymmetric) {
 123   Time zero_time(Time::FromTimeT(0));
 124   EXPECT_EQ(0, zero_time.ToTimeT());
 125
 126   EXPECT_EQ(0.0, zero_time.ToDoubleT());
 127 }
 128
 129 TEST_F(TimeTest, LocalExplode) {
 130   Time a = Time::Now();
 131   Time::Exploded exploded;
 132   a.LocalExplode(&exploded);
 133
 134   Time b = Time::FromLocalExploded(exploded);
 135
 136   // The exploded structure doesn't have microseconds, and on Mac & Linux, the
 137   // internal OS conversion uses seconds, which will cause truncation. So we
 138   // can only make sure that the delta is within one second.
 139   EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
 140 }
 141
 142 TEST_F(TimeTest, UTCExplode) {
 143   Time a = Time::Now();
 144   Time::Exploded exploded;
 145   a.UTCExplode(&exploded);
 146
 147   Time b = Time::FromUTCExploded(exploded);
 148   EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
 149 }
 150
 151 TEST_F(TimeTest, LocalMidnight) {
 152   Time::Exploded exploded;
 153   Time::Now().LocalMidnight().LocalExplode(&exploded);
 154   EXPECT_EQ(0, exploded.hour);
 155   EXPECT_EQ(0, exploded.minute);
 156   EXPECT_EQ(0, exploded.second);
 157   EXPECT_EQ(0, exploded.millisecond);
 158 }
 159
 160 TEST_F(TimeTest, ParseTimeTest1) {
 161   time_t current_time = 0;
 162   time(&current_time);
 163
 164   const int BUFFER_SIZE = 64;
 165   struct tm local_time = {0};
 166   char time_buf[BUFFER_SIZE] = {0};
 167 #if defined(OS_WIN)
 168   localtime_s(&local_time, &current_time);
 169   asctime_s(time_buf, arraysize(time_buf), &local_time);
 170 #elif defined(OS_POSIX)
 171   localtime_r(&current_time, &local_time);
 172   asctime_r(&local_time, time_buf);
 173 #endif
 174
 175   Time parsed_time;
 176   EXPECT_TRUE(Time::FromString(time_buf, &parsed_time));
 177   EXPECT_EQ(current_time, parsed_time.ToTimeT());
 178 }
 179
 180 TEST_F(TimeTest, DayOfWeekSunday) {
 181   Time time;
 182   EXPECT_TRUE(Time::FromString("Sun, 06 May 2012 12:00:00 GMT", &time));
 183   Time::Exploded exploded;
 184   time.UTCExplode(&exploded);
 185   EXPECT_EQ(0, exploded.day_of_week);
 186 }
 187
 188 TEST_F(TimeTest, DayOfWeekWednesday) {
 189   Time time;
 190   EXPECT_TRUE(Time::FromString("Wed, 09 May 2012 12:00:00 GMT", &time));
 191   Time::Exploded exploded;
 192   time.UTCExplode(&exploded);
 193   EXPECT_EQ(3, exploded.day_of_week);
 194 }
 195
 196 TEST_F(TimeTest, DayOfWeekSaturday) {
 197   Time time;
 198   EXPECT_TRUE(Time::FromString("Sat, 12 May 2012 12:00:00 GMT", &time));
 199   Time::Exploded exploded;
 200   time.UTCExplode(&exploded);
 201   EXPECT_EQ(6, exploded.day_of_week);
 202 }
 203
 204 TEST_F(TimeTest, ParseTimeTest2) {
 205   Time parsed_time;
 206   EXPECT_TRUE(Time::FromString("Mon, 15 Oct 2007 19:45:00 GMT", &parsed_time));
 207   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 208 }
 209
 210 TEST_F(TimeTest, ParseTimeTest3) {
 211   Time parsed_time;
 212   EXPECT_TRUE(Time::FromString("15 Oct 07 12:45:00", &parsed_time));
 213   EXPECT_EQ(comparison_time_local_, parsed_time);
 214 }
 215
 216 TEST_F(TimeTest, ParseTimeTest4) {
 217   Time parsed_time;
 218   EXPECT_TRUE(Time::FromString("15 Oct 07 19:45 GMT", &parsed_time));
 219   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 220 }
 221
 222 TEST_F(TimeTest, ParseTimeTest5) {
 223   Time parsed_time;
 224   EXPECT_TRUE(Time::FromString("Mon Oct 15 12:45 PDT 2007", &parsed_time));
 225   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 226 }
 227
 228 TEST_F(TimeTest, ParseTimeTest6) {
 229   Time parsed_time;
 230   EXPECT_TRUE(Time::FromString("Monday, Oct 15, 2007 12:45 PM", &parsed_time));
 231   EXPECT_EQ(comparison_time_local_, parsed_time);
 232 }
 233
 234 TEST_F(TimeTest, ParseTimeTest7) {
 235   Time parsed_time;
 236   EXPECT_TRUE(Time::FromString("10/15/07 12:45:00 PM", &parsed_time));
 237   EXPECT_EQ(comparison_time_local_, parsed_time);
 238 }
 239
 240 TEST_F(TimeTest, ParseTimeTest8) {
 241   Time parsed_time;
 242   EXPECT_TRUE(Time::FromString("15-OCT-2007 12:45pm", &parsed_time));
 243   EXPECT_EQ(comparison_time_local_, parsed_time);
 244 }
 245
 246 TEST_F(TimeTest, ParseTimeTest9) {
 247   Time parsed_time;
 248   EXPECT_TRUE(Time::FromString("16 Oct 2007 4:45-JST (Tuesday)", &parsed_time));
 249   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 250 }
 251
 252 TEST_F(TimeTest, ParseTimeTest10) {
 253   Time parsed_time;
 254   EXPECT_TRUE(Time::FromString("15/10/07 12:45", &parsed_time));
 255   EXPECT_EQ(parsed_time, comparison_time_local_);
 256 }
 257
 258 // Test some of edge cases around epoch, etc.
 259 TEST_F(TimeTest, ParseTimeTestEpoch0) {
 260   Time parsed_time;
 261
 262   // time_t == epoch == 0
 263   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:00 +0100 1970",
 264                                &parsed_time));
 265   EXPECT_EQ(0, parsed_time.ToTimeT());
 266   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:00 GMT 1970",
 267                                &parsed_time));
 268   EXPECT_EQ(0, parsed_time.ToTimeT());
 269 }
 270
 271 TEST_F(TimeTest, ParseTimeTestEpoch1) {
 272   Time parsed_time;
 273
 274   // time_t == 1 second after epoch == 1
 275   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:01 +0100 1970",
 276                                &parsed_time));
 277   EXPECT_EQ(1, parsed_time.ToTimeT());
 278   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:01 GMT 1970",
 279                                &parsed_time));
 280   EXPECT_EQ(1, parsed_time.ToTimeT());
 281 }
 282
 283 TEST_F(TimeTest, ParseTimeTestEpoch2) {
 284   Time parsed_time;
 285
 286   // time_t == 2 seconds after epoch == 2
 287   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:02 +0100 1970",
 288                                &parsed_time));
 289   EXPECT_EQ(2, parsed_time.ToTimeT());
 290   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:02 GMT 1970",
 291                                &parsed_time));
 292   EXPECT_EQ(2, parsed_time.ToTimeT());
 293 }
 294
 295 TEST_F(TimeTest, ParseTimeTestEpochNeg1) {
 296   Time parsed_time;
 297
 298   // time_t == 1 second before epoch == -1
 299   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:59 +0100 1970",
 300                                &parsed_time));
 301   EXPECT_EQ(-1, parsed_time.ToTimeT());
 302   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 1969",
 303                                &parsed_time));
 304   EXPECT_EQ(-1, parsed_time.ToTimeT());
 305 }
 306
 307 // If time_t is 32 bits, a date after year 2038 will overflow time_t and
 308 // cause timegm() to return -1.  The parsed time should not be 1 second
 309 // before epoch.
 310 TEST_F(TimeTest, ParseTimeTestEpochNotNeg1) {
 311   Time parsed_time;
 312
 313   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 2100",
 314                                &parsed_time));
 315   EXPECT_NE(-1, parsed_time.ToTimeT());
 316 }
 317
 318 TEST_F(TimeTest, ParseTimeTestEpochNeg2) {
 319   Time parsed_time;
 320
 321   // time_t == 2 seconds before epoch == -2
 322   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:58 +0100 1970",
 323                                &parsed_time));
 324   EXPECT_EQ(-2, parsed_time.ToTimeT());
 325   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:58 GMT 1969",
 326                                &parsed_time));
 327   EXPECT_EQ(-2, parsed_time.ToTimeT());
 328 }
 329
 330 TEST_F(TimeTest, ParseTimeTestEpoch1960) {
 331   Time parsed_time;
 332
 333   // time_t before Epoch, in 1960
 334   EXPECT_TRUE(Time::FromString("Wed Jun 29 19:40:01 +0100 1960",
 335                                &parsed_time));
 336   EXPECT_EQ(-299999999, parsed_time.ToTimeT());
 337   EXPECT_TRUE(Time::FromString("Wed Jun 29 18:40:01 GMT 1960",
 338                                &parsed_time));
 339   EXPECT_EQ(-299999999, parsed_time.ToTimeT());
 340   EXPECT_TRUE(Time::FromString("Wed Jun 29 17:40:01 GMT 1960",
 341                                &parsed_time));
 342   EXPECT_EQ(-300003599, parsed_time.ToTimeT());
 343 }
 344
 345 TEST_F(TimeTest, ParseTimeTestEmpty) {
 346   Time parsed_time;
 347   EXPECT_FALSE(Time::FromString("", &parsed_time));
 348 }
 349
 350 TEST_F(TimeTest, ParseTimeTestInvalidString) {
 351   Time parsed_time;
 352   EXPECT_FALSE(Time::FromString("Monday morning 2000", &parsed_time));
 353 }
 354
 355 TEST_F(TimeTest, ExplodeBeforeUnixEpoch) {
 356   static const int kUnixEpochYear = 1970;  // In case this changes (ha!).
 357   Time t;
 358   Time::Exploded exploded;
 359
 360   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1);
 361   t.UTCExplode(&exploded);
 362   EXPECT_TRUE(exploded.HasValidValues());
 363   // Should be 1969-12-31 23:59:59 999 milliseconds (and 999 microseconds).
 364   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 365   EXPECT_EQ(12, exploded.month);
 366   EXPECT_EQ(31, exploded.day_of_month);
 367   EXPECT_EQ(23, exploded.hour);
 368   EXPECT_EQ(59, exploded.minute);
 369   EXPECT_EQ(59, exploded.second);
 370   EXPECT_EQ(999, exploded.millisecond);
 371
 372   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1000);
 373   t.UTCExplode(&exploded);
 374   EXPECT_TRUE(exploded.HasValidValues());
 375   // Should be 1969-12-31 23:59:59 999 milliseconds.
 376   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 377   EXPECT_EQ(12, exploded.month);
 378   EXPECT_EQ(31, exploded.day_of_month);
 379   EXPECT_EQ(23, exploded.hour);
 380   EXPECT_EQ(59, exploded.minute);
 381   EXPECT_EQ(59, exploded.second);
 382   EXPECT_EQ(999, exploded.millisecond);
 383
 384   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1001);
 385   t.UTCExplode(&exploded);
 386   EXPECT_TRUE(exploded.HasValidValues());
 387   // Should be 1969-12-31 23:59:59 998 milliseconds (and 999 microseconds).
 388   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 389   EXPECT_EQ(12, exploded.month);
 390   EXPECT_EQ(31, exploded.day_of_month);
 391   EXPECT_EQ(23, exploded.hour);
 392   EXPECT_EQ(59, exploded.minute);
 393   EXPECT_EQ(59, exploded.second);
 394   EXPECT_EQ(998, exploded.millisecond);
 395
 396   t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1000);
 397   t.UTCExplode(&exploded);
 398   EXPECT_TRUE(exploded.HasValidValues());
 399   // Should be 1969-12-31 23:59:59.
 400   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 401   EXPECT_EQ(12, exploded.month);
 402   EXPECT_EQ(31, exploded.day_of_month);
 403   EXPECT_EQ(23, exploded.hour);
 404   EXPECT_EQ(59, exploded.minute);
 405   EXPECT_EQ(59, exploded.second);
 406   EXPECT_EQ(0, exploded.millisecond);
 407
 408   t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1001);
 409   t.UTCExplode(&exploded);
 410   EXPECT_TRUE(exploded.HasValidValues());
 411   // Should be 1969-12-31 23:59:58 999 milliseconds.
 412   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 413   EXPECT_EQ(12, exploded.month);
 414   EXPECT_EQ(31, exploded.day_of_month);
 415   EXPECT_EQ(23, exploded.hour);
 416   EXPECT_EQ(59, exploded.minute);
 417   EXPECT_EQ(58, exploded.second);
 418   EXPECT_EQ(999, exploded.millisecond);
 419
 420   // Make sure we still handle at/after Unix epoch correctly.
 421   t = Time::UnixEpoch();
 422   t.UTCExplode(&exploded);
 423   EXPECT_TRUE(exploded.HasValidValues());
 424   // Should be 1970-12-31 00:00:00 0 milliseconds.
 425   EXPECT_EQ(kUnixEpochYear, exploded.year);
 426   EXPECT_EQ(1, exploded.month);
 427   EXPECT_EQ(1, exploded.day_of_month);
 428   EXPECT_EQ(0, exploded.hour);
 429   EXPECT_EQ(0, exploded.minute);
 430   EXPECT_EQ(0, exploded.second);
 431   EXPECT_EQ(0, exploded.millisecond);
 432
 433   t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1);
 434   t.UTCExplode(&exploded);
 435   EXPECT_TRUE(exploded.HasValidValues());
 436   // Should be 1970-01-01 00:00:00 0 milliseconds (and 1 microsecond).
 437   EXPECT_EQ(kUnixEpochYear, exploded.year);
 438   EXPECT_EQ(1, exploded.month);
 439   EXPECT_EQ(1, exploded.day_of_month);
 440   EXPECT_EQ(0, exploded.hour);
 441   EXPECT_EQ(0, exploded.minute);
 442   EXPECT_EQ(0, exploded.second);
 443   EXPECT_EQ(0, exploded.millisecond);
 444
 445   t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1000);
 446   t.UTCExplode(&exploded);
 447   EXPECT_TRUE(exploded.HasValidValues());
 448   // Should be 1970-01-01 00:00:00 1 millisecond.
 449   EXPECT_EQ(kUnixEpochYear, exploded.year);
 450   EXPECT_EQ(1, exploded.month);
 451   EXPECT_EQ(1, exploded.day_of_month);
 452   EXPECT_EQ(0, exploded.hour);
 453   EXPECT_EQ(0, exploded.minute);
 454   EXPECT_EQ(0, exploded.second);
 455   EXPECT_EQ(1, exploded.millisecond);
 456
 457   t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1000);
 458   t.UTCExplode(&exploded);
 459   EXPECT_TRUE(exploded.HasValidValues());
 460   // Should be 1970-01-01 00:00:01.
 461   EXPECT_EQ(kUnixEpochYear, exploded.year);
 462   EXPECT_EQ(1, exploded.month);
 463   EXPECT_EQ(1, exploded.day_of_month);
 464   EXPECT_EQ(0, exploded.hour);
 465   EXPECT_EQ(0, exploded.minute);
 466   EXPECT_EQ(1, exploded.second);
 467   EXPECT_EQ(0, exploded.millisecond);
 468
 469   t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1001);
 470   t.UTCExplode(&exploded);
 471   EXPECT_TRUE(exploded.HasValidValues());
 472   // Should be 1970-01-01 00:00:01 1 millisecond.
 473   EXPECT_EQ(kUnixEpochYear, exploded.year);
 474   EXPECT_EQ(1, exploded.month);
 475   EXPECT_EQ(1, exploded.day_of_month);
 476   EXPECT_EQ(0, exploded.hour);
 477   EXPECT_EQ(0, exploded.minute);
 478   EXPECT_EQ(1, exploded.second);
 479   EXPECT_EQ(1, exploded.millisecond);
 480 }
 481
 482 TEST_F(TimeTest, Max) {
 483   Time max = Time::Max();
 484   EXPECT_TRUE(max.is_max());
 485   EXPECT_EQ(max, Time::Max());
 486   EXPECT_GT(max, Time::Now());
 487   EXPECT_GT(max, Time());
 488 }
 489
 490 TEST_F(TimeTest, MaxConversions) {
 491   Time t = Time::Max();
 492   EXPECT_EQ(std::numeric_limits<int64>::max(), t.ToInternalValue());
 493
 494   t = Time::FromDoubleT(std::numeric_limits<double>::max());
 495   EXPECT_TRUE(t.is_max());
 496   EXPECT_EQ(std::numeric_limits<double>::max(), t.ToDoubleT());
 497
 498   t = Time::FromJsTime(std::numeric_limits<double>::max());
 499   EXPECT_TRUE(t.is_max());
 500   EXPECT_EQ(std::numeric_limits<double>::max(), t.ToJsTime());
 501
 502   t = Time::FromTimeT(std::numeric_limits<time_t>::max());
 503   EXPECT_TRUE(t.is_max());
 504   EXPECT_EQ(std::numeric_limits<time_t>::max(), t.ToTimeT());
 505
 506 #if defined(OS_POSIX)
 507   struct timeval tval;
 508   tval.tv_sec = std::numeric_limits<time_t>::max();
 509   tval.tv_usec = static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1;
 510   t = Time::FromTimeVal(tval);
 511   EXPECT_TRUE(t.is_max());
 512   tval = t.ToTimeVal();
 513   EXPECT_EQ(std::numeric_limits<time_t>::max(), tval.tv_sec);
 514   EXPECT_EQ(static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1,
 515       tval.tv_usec);
 516 #endif
 517
 518 #if defined(OS_MACOSX)
 519   t = Time::FromCFAbsoluteTime(std::numeric_limits<CFAbsoluteTime>::max());
 520   EXPECT_TRUE(t.is_max());
 521   EXPECT_EQ(std::numeric_limits<CFAbsoluteTime>::max(), t.ToCFAbsoluteTime());
 522 #endif
 523
 524 #if defined(OS_WIN)
 525   FILETIME ftime;
 526   ftime.dwHighDateTime = std::numeric_limits<DWORD>::max();
 527   ftime.dwLowDateTime = std::numeric_limits<DWORD>::max();
 528   t = Time::FromFileTime(ftime);
 529   EXPECT_TRUE(t.is_max());
 530   ftime = t.ToFileTime();
 531   EXPECT_EQ(std::numeric_limits<DWORD>::max(), ftime.dwHighDateTime);
 532   EXPECT_EQ(std::numeric_limits<DWORD>::max(), ftime.dwLowDateTime);
 533 #endif
 534 }
 535
 536 #if defined(OS_MACOSX)
 537 TEST_F(TimeTest, TimeTOverflow) {
 538   Time t = Time::FromInternalValue(std::numeric_limits<int64>::max() - 1);
 539   EXPECT_FALSE(t.is_max());
 540   EXPECT_EQ(std::numeric_limits<time_t>::max(), t.ToTimeT());
 541 }
 542 #endif
 543
 544 TEST(TimeTicks, Deltas) {
 545   for (int index = 0; index < 50; index++) {
 546     TimeTicks ticks_start = TimeTicks::Now();
 547     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
 548     TimeTicks ticks_stop = TimeTicks::Now();
 549     TimeDelta delta = ticks_stop - ticks_start;
 550     // Note:  Although we asked for a 10ms sleep, if the
 551     // time clock has a finer granularity than the Sleep()
 552     // clock, it is quite possible to wakeup early.  Here
 553     // is how that works:
 554     //      Time(ms timer)      Time(us timer)
 555     //          5                   5010
 556     //          6                   6010
 557     //          7                   7010
 558     //          8                   8010
 559     //          9                   9000
 560     // Elapsed  4ms                 3990us
 561     //
 562     // Unfortunately, our InMilliseconds() function truncates
 563     // rather than rounds.  We should consider fixing this
 564     // so that our averages come out better.
 565     EXPECT_GE(delta.InMilliseconds(), 9);
 566     EXPECT_GE(delta.InMicroseconds(), 9000);
 567     EXPECT_EQ(delta.InSeconds(), 0);
 568   }
 569 }
 570
 571 static void HighResClockTest(TimeTicks (*GetTicks)()) {
 572 #if defined(OS_WIN)
 573   // HighResNow doesn't work on some systems.  Since the product still works
 574   // even if it doesn't work, it makes this entire test questionable.
 575   if (!TimeTicks::IsHighResClockWorking())
 576     return;
 577 #endif
 578
 579   // Why do we loop here?
 580   // We're trying to measure that intervals increment in a VERY small amount
 581   // of time --  less than 15ms.  Unfortunately, if we happen to have a
 582   // context switch in the middle of our test, the context switch could easily
 583   // exceed our limit.  So, we iterate on this several times.  As long as we're
 584   // able to detect the fine-granularity timers at least once, then the test
 585   // has succeeded.
 586
 587   const int kTargetGranularityUs = 15000;  // 15ms
 588
 589   bool success = false;
 590   int retries = 100;  // Arbitrary.
 591   TimeDelta delta;
 592   while (!success && retries--) {
 593     TimeTicks ticks_start = GetTicks();
 594     // Loop until we can detect that the clock has changed.  Non-HighRes timers
 595     // will increment in chunks, e.g. 15ms.  By spinning until we see a clock
 596     // change, we detect the minimum time between measurements.
 597     do {
 598       delta = GetTicks() - ticks_start;
 599     } while (delta.InMilliseconds() == 0);
 600
 601     if (delta.InMicroseconds() <= kTargetGranularityUs)
 602       success = true;
 603   }
 604
 605   // In high resolution mode, we expect to see the clock increment
 606   // in intervals less than 15ms.
 607   EXPECT_TRUE(success);
 608 }
 609
 610 TEST(TimeTicks, HighResNow) {
 611   HighResClockTest(&TimeTicks::HighResNow);
 612 }
 613
 614 TEST(TimeTicks, NowFromSystemTraceTime) {
 615   // Re-use HighResNow test for now since clock properties are identical.
 616   HighResClockTest(&TimeTicks::NowFromSystemTraceTime);
 617 }
 618
 619 TEST(TimeDelta, FromAndIn) {
 620   EXPECT_TRUE(TimeDelta::FromDays(2) == TimeDelta::FromHours(48));
 621   EXPECT_TRUE(TimeDelta::FromHours(3) == TimeDelta::FromMinutes(180));
 622   EXPECT_TRUE(TimeDelta::FromMinutes(2) == TimeDelta::FromSeconds(120));
 623   EXPECT_TRUE(TimeDelta::FromSeconds(2) == TimeDelta::FromMilliseconds(2000));
 624   EXPECT_TRUE(TimeDelta::FromMilliseconds(2) ==
 625               TimeDelta::FromMicroseconds(2000));
 626   EXPECT_EQ(13, TimeDelta::FromDays(13).InDays());
 627   EXPECT_EQ(13, TimeDelta::FromHours(13).InHours());
 628   EXPECT_EQ(13, TimeDelta::FromMinutes(13).InMinutes());
 629   EXPECT_EQ(13, TimeDelta::FromSeconds(13).InSeconds());
 630   EXPECT_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
 631   EXPECT_EQ(13, TimeDelta::FromMilliseconds(13).InMilliseconds());
 632   EXPECT_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
 633   EXPECT_EQ(13, TimeDelta::FromMicroseconds(13).InMicroseconds());
 634 }
 635
 636 #if defined(OS_POSIX)
 637 TEST(TimeDelta, TimeSpecConversion) {
 638   struct timespec result = TimeDelta::FromSeconds(0).ToTimeSpec();
 639   EXPECT_EQ(result.tv_sec, 0);
 640   EXPECT_EQ(result.tv_nsec, 0);
 641
 642   result = TimeDelta::FromSeconds(1).ToTimeSpec();
 643   EXPECT_EQ(result.tv_sec, 1);
 644   EXPECT_EQ(result.tv_nsec, 0);
 645
 646   result = TimeDelta::FromMicroseconds(1).ToTimeSpec();
 647   EXPECT_EQ(result.tv_sec, 0);
 648   EXPECT_EQ(result.tv_nsec, 1000);
 649
 650   result = TimeDelta::FromMicroseconds(
 651       Time::kMicrosecondsPerSecond + 1).ToTimeSpec();
 652   EXPECT_EQ(result.tv_sec, 1);
 653   EXPECT_EQ(result.tv_nsec, 1000);
 654 }
 655 #endif  // OS_POSIX
 656
 657 // Our internal time format is serialized in things like databases, so it's
 658 // important that it's consistent across all our platforms.  We use the 1601
 659 // Windows epoch as the internal format across all platforms.
 660 TEST(TimeDelta, WindowsEpoch) {
 661   Time::Exploded exploded;
 662   exploded.year = 1970;
 663   exploded.month = 1;
 664   exploded.day_of_week = 0;  // Should be unusued.
 665   exploded.day_of_month = 1;
 666   exploded.hour = 0;
 667   exploded.minute = 0;
 668   exploded.second = 0;
 669   exploded.millisecond = 0;
 670   Time t = Time::FromUTCExploded(exploded);
 671   // Unix 1970 epoch.
 672   EXPECT_EQ(GG_INT64_C(11644473600000000), t.ToInternalValue());
 673
 674   // We can't test 1601 epoch, since the system time functions on Linux
 675   // only compute years starting from 1900.
 676 }