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<?php $daysInMonth = array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); $errors = array(); for ($year = 1500; $year < 2000; $year++) { for ($month = 1; $month <= 12; $month++) { $monthErrors = 0; for ($day = 1; $day < $daysInMonth[$month]; $day++) { $baseString = sprintf("%4d-%02d-%02d 00:00:00", $year, $month, $day); $timestamp = strtotime($baseString); $roundTrip = date("Y-m-d H:i:s", $timestamp); if ($baseString !== $roundTrip) { $errors[] = "$baseString ($timestamp) $roundTrip"; $monthErrors++; if ($monthErrors > 10) { break 2; } } } } } $resolvedErrors = array(); if (count($errors) > 50) { $errorCount = count($errors); $delta = $errorCount / 50.0; $currentIndex = 0; do { $resolvedErrors[$currentIndex] = $errors[floor($currentIndex)]; $currentIndex += $delta; } while ($currentIndex < $errorCount); } else { $resolvedErrors = $errors; } echo implode("\n", $resolvedErrors);
Output for git.master, git.master_jit, rfc.property-hooks
1916-05-01 00:00:00 (-1693700372) 1916-05-01 01:00:00 1937-07-01 00:00:00 (-1025745572) 1937-07-01 00:00:28 1940-05-16 00:00:00 (-935022000) 1940-05-16 01:40:00

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