Online PHP editor | output for AZpkv

<?php // creates new DateTime for the current timezone (UTC-5 in my case) $expiresAt = new \DateTimeImmutable('+3600 seconds', new \DateTimeZone('-5')); echo 'expires: ' . $expiresAt->format(\DateTimeInterface::ISO8601) . "\n"; $generatedAt = ($expiresAt->getTimestamp() - 3600); // creates new DateTime in UTC $createdAtTime = \DateTimeImmutable::createFromFormat('U', (string) $generatedAt); echo 'created: ' . $createdAtTime->format(\DateTimeInterface::ISO8601) . "\n"; $interval = $expiresAt->diff($createdAtTime); echo 'computed interval: ' . $interval->format('%R[%yy %mM %dd %hh %im %ss]') . "\n";