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<?php ini_set('date.timezone', 'Europe/Berlin'); date_default_timezone_set('Europe/Berlin'); $date1 = new DateTime("2015-03-29 02:00:00"); $date2 = new DateTime("2015-03-29 03:00:00"); $interval = date_diff($date1, $date2); echo $interval->format('%H Hour(s) %I Minute(s) %S Second(s)' ); # daylight saving time in Europe. Result is correct: 0 hours. echo "\n"; $date1 = new DateTime("2015-03-29 01:00:00"); $date2 = new DateTime("2015-03-29 03:00:00"); $interval = date_diff($date1, $date2); echo $interval->format('%H Hour(s) %I Minute(s) %S Second(s)' ); # The result is incorrect: should be 1 hour only. ?>

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