- date_diff: documentation ( source)
- date_create: documentation ( source)
- print_r: documentation ( source)
<?php
$date1=date_create("15-04-2018 22:00", new DateTimeZone('Asia/Ulan_Bator'));
$date2=date_create("now", new DateTimeZone('America/Buenos_Aires'));
$diff=date_diff($date1,$date2);
print_r($diff->days == 457);
?>