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<?php function timezoneExhibitsDST($tzId) { $tz = new DateTimeZone($tzId); $date = new DateTime("now",$tz); $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 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [ts] => 1509238800 [time] => 2017-10-29T01:00:00+00:00 [offset] => 0 [isdst] => [abbr] => GMT ) bool(true)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [ts] => 1509238800 [time] => 2017-10-29T01:00:00+00:00 [offset] => 0 [isdst] => [abbr] => GMT ) bool(true)
Output for 7.3.24 - 7.3.33, 7.4.12 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Array ( [ts] => 1509238800 [time] => 2017-10-29T01:00:00+0000 [offset] => 0 [isdst] => [abbr] => GMT ) bool(true)
preferences:
134.34 ms | 402 KiB | 118 Q