Online PHP editor | output for 9KCZE

<?php function getYearsBetween( \DateTimeImmutable $startDate, \DateTimeImmutable $endDate, ): int { $dateInterval = $startDate->diff($endDate); return $endDate > $startDate ? $dateInterval->y : -$dateInterval->y; } $start = new \DateTimeImmutable('2000-11-01 09:29:22.907606', new \DateTimeZone('America/Chicago')); $end = new \DateTimeImmutable('2022-06-06 11:00:00.000000', new \DateTimeZone('America/New_York')); $end = $end->setTimezone(new \DateTimeZone('America/Chicago')); $result = getYearsBetween($start, $end); var_export($result);