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<?php $tz = new \DateTimeZone('Europe/Moscow'); $dt = new \DateTimeImmutable('now'); $dt = $dt->setTimezone($tz); $timestamp = (int) $dt->format('U'); $timestamp += 1000; $dt2 = \DateTimeImmutable::createFromFormat('U', $timestamp, $tz); assert($dt->getTimezone() === $dt2->getTimezone());

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