<?php
$daysInMonth = array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
for ($year = 1500; $year < 2000; $year++) {
for ($month = 1; $month <= 12; $month++) {
for ($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 !== $roundTrip) {
echo "$baseString ($timestamp) $roundTrip\n";
}
}
}
}
preferences:
40.18 ms | 402 KiB | 5 Q