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run code in 300+ PHP versions simultaneously
<?php defined("PHP_EOL") || define("PHP_EOL", "\n"); if (function_exists('date_default_timezone_get')) { echo "System default timezone: ", date_default_timezone_get(), PHP_EOL; } $time = strtotime('1582-12-14 00:00:00'); echo $time . PHP_EOL; $time526 = -12214109972; $time430 = -12214108800; $date526 = gmdate('Y-m-d H:i:s', $time526); $date430 = gmdate('Y-m-d H:i:s', $time430); echo $time526 . ' ' . $date526, PHP_EOL; echo $time430 . ' ' . $date430, PHP_EOL;

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