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<?php date_default_timezone_set( 'Europe/London' ); $a = new DateTimeImmutable('2023-08-12 13:00:00'); $b = new DateTimeImmutable('2023-08-11 13:01:00'); echo $a->diff($b)->format('%h hours %i minutes'); echo PHP_EOL; $t = strtotime('2023-08-12 13:00:00') - strtotime('2023-08-11 13:01:00'); echo date('H:i', $t);
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