Online PHP editor | refs for KAl19

<?php function diff($a, $b) { static $FMT = "Y-m-d H:i:s P (\D\S\T=I)"; printf("%20s: %s -> %s\n", $a->format("e"), $a->format($FMT), $b->format($FMT)); } $havana1 = new DateTime("@1615611600"); $havana1->setTimezone(new DateTimeZone("America/Havana")); $havana2 = (clone $havana1)->add(new DateInterval("P1D")); diff($havana1, $havana2); $tehran1 = new DateTime("@1616272200"); $tehran1->setTimezone(new DateTimeZone("Asia/Tehran")); $tehran2 = (clone $tehran1)->add(new DateInterval("P1D")); diff($tehran1, $tehran2); $la1 = new DateTime("@1615708800"); $la1->setTimezone(new DateTimeZone("America/Los_Angeles")); $la2 = (clone $la1)->add(new DateInterval("P1D")); diff($la1, $la2);