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<?php $tz = new DateTimeZone('America/Chicago'); // A timezone that has DST $five_hours_interval = new DateInterval('PT5H'); $date = new DateTime("2019-11-03 00:00:00", $tz); // goes backward at 2am echo $date->format('c') . "\n"; // Add five hours and subtract 5 hours. The $newDate should then equal the date. $five_hours_later = $date->add($five_hours_interval); $newDate = $five_hours_later->sub($five_hours_interval); echo $newDate->format('c');
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
2019-11-03T00:00:00-05:00 2019-11-03T00:00:00-05:00

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167.96 ms | 403 KiB | 176 Q