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@ 2018-03-09T10:39:13Z

<?php

$t = new DateTime("2015-01-07 14:00:00", new DateTimeZone("Europe/Berlin"));

if (date_format($t, 'I') === 1) {
    echo("SOMMERZEIT");
} else {
    echo("WINTERZEIT");
}

Output
Performance
VLD
References
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date_format: documentation ( source)

preferences:dark modelive preview

76.8 ms | 402 KiB | 5 Q