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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 git.master, git.master_jit, rfc.property-hooks
-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 )

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