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<?php function timeZoneToOffset(string $timeZone): \DateTimeImmutable { return new DateTimeImmutable( '2020-01-01 15:00' . (new \DateTime('now', new DateTimeZone($timeZone)))->format('P') ); } var_dump(timeZoneToOffset('Europe/Paris')->getTimestamp() === timeZoneToOffset('Africa/Cairo')->getTimestamp());
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.26, 8.1.0 - 8.1.13, 8.2rc1
bool(true)

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58.6 ms | 409 KiB | 5 Q