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<?php function timezoneExhibitsDST($tzId) { $tz = new DateTimeZone($tzId); $date = new DateTime("now",$tz); var_dump($date->format('c')); $trans = $tz->getTransitions(); foreach ($trans as $k => $t) if ($t["ts"] > $date->format('U')) { print_r($t); return $trans[$k-1]['isdst']; } } var_dump(timezoneExhibitsDST("Europe/London"));
Output for git.master, git.master_jit, rfc.property-hooks
string(25) "2017-07-12T04:05:47+01:00" Array ( [ts] => 1509238800 [time] => 2017-10-29T01:00:00+00:00 [offset] => 0 [isdst] => [abbr] => GMT ) bool(true)

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