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<?php $tests[] = '0000-01-28 00:00:00 UTC'; $tests[] = '0000-01-29 00:00:00 UTC'; $tests[] = '0000-01-30 00:00:00 UTC'; $tests[] = '0000-01-31 00:00:00 UTC'; $tests[] = '0000-02-01 00:00:00 UTC'; $tests[] = '0000-02-27 00:00:00 UTC'; $tests[] = '0000-02-28 00:00:00 UTC'; $tests[] = '0000-02-29 00:00:00 UTC'; $tests[] = '0000-02-30 00:00:00 UTC'; // intentionally invalid day, should be the same as the next. $tests[] = '0000-03-01 00:00:00 UTC'; $tests[] = '0000-03-02 00:00:00 UTC'; foreach ($tests as $test) { $timestamp1 = strtotime($test); $date_time = new DateTime('@' . $timestamp1); $timestamp2 = $date_time->getTimestamp(); print $timestamp1 . "\n"; print $timestamp2 . "\n"; if ($timestamp1 != $timestamp2) { print "timestamps are not equal\n"; } print_r($date_time); print "\n"; }

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Output for 7.2.0 - 7.2.31, 7.3.0 - 7.3.19, 7.4.0 - 7.4.7, 8.1.24 - 8.1.29, 8.2.11 - 8.2.23, 8.3.0 - 8.3.11
-62164886400 -62164886400 DateTime Object ( [date] => 0000-01-28 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164800000 -62164800000 DateTime Object ( [date] => 0000-01-29 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164713600 -62164800000 timestamps are not equal DateTime Object ( [date] => 0000-01-29 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164627200 -62164713600 timestamps are not equal DateTime Object ( [date] => 0000-01-30 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164540800 -62164627200 timestamps are not equal DateTime Object ( [date] => 0000-01-31 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162294400 -62162380800 timestamps are not equal DateTime Object ( [date] => 0000-02-26 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162208000 -62162294400 timestamps are not equal DateTime Object ( [date] => 0000-02-27 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162121600 -62162208000 timestamps are not equal DateTime Object ( [date] => 0000-02-28 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162035200 -62162035200 DateTime Object ( [date] => 0000-03-01 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162035200 -62162035200 DateTime Object ( [date] => 0000-03-01 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62161948800 -62161948800 DateTime Object ( [date] => 0000-03-02 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 )
Output for 5.4.30 - 5.4.45, 5.5.14 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
-62164886400 -62164886400 DateTime Object ( [date] => 0000-01-28 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164800000 -62164800000 DateTime Object ( [date] => 0000-01-29 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164713600 -62164713600 DateTime Object ( [date] => 0000-01-30 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164627200 -62164627200 DateTime Object ( [date] => 0000-01-31 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62164540800 -62164540800 DateTime Object ( [date] => 0000-02-01 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162294400 -62162294400 DateTime Object ( [date] => 0000-02-27 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162208000 -62162208000 DateTime Object ( [date] => 0000-02-28 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162121600 -62162121600 DateTime Object ( [date] => 0000-02-29 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162035200 -62162035200 DateTime Object ( [date] => 0000-03-01 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62162035200 -62162035200 DateTime Object ( [date] => 0000-03-01 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 ) -62161948800 -62161948800 DateTime Object ( [date] => 0000-03-02 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 )
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.29, 5.5.0 - 5.5.13
-62164886400 -62164886400 DateTime Object ( [date] => 0000-01-28 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62164800000 -62164800000 DateTime Object ( [date] => 0000-01-29 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62164713600 -62164713600 DateTime Object ( [date] => 0000-01-30 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62164627200 -62164627200 DateTime Object ( [date] => 0000-01-31 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62164540800 -62164540800 DateTime Object ( [date] => 0000-02-01 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62162294400 -62162294400 DateTime Object ( [date] => 0000-02-27 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62162208000 -62162208000 DateTime Object ( [date] => 0000-02-28 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62162121600 -62162121600 DateTime Object ( [date] => 0000-02-29 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62162035200 -62162035200 DateTime Object ( [date] => 0000-03-01 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62162035200 -62162035200 DateTime Object ( [date] => 0000-03-01 00:00:00 [timezone_type] => 1 [timezone] => +00:00 ) -62161948800 -62161948800 DateTime Object ( [date] => 0000-03-02 00:00:00 [timezone_type] => 1 [timezone] => +00:00 )
Output for 5.2.10 - 5.2.17
Fatal error: Call to undefined method DateTime::getTimestamp() in /in/IQC21 on line 20
Process exited with code 255.
Output for 5.2.6 - 5.2.9

Process exited with code 137.
Output for 5.2.4 - 5.2.5
Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (@) at position 0 (@): Unexpected character' in /in/IQC21:19 Stack trace: #0 /in/IQC21(19): DateTime->__construct('@') #1 {main} thrown in /in/IQC21 on line 19
Process exited with code 255.
Output for 5.2.0 - 5.2.3
Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (@) at position 0 (' in /in/IQC21:19 Stack trace: #0 /in/IQC21(19): DateTime->__construct('@') #1 {main} thrown in /in/IQC21 on line 19
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/IQC21 on line 19
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/IQC21 on line 19
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/IQC21 on line 19
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