<?php $value = 41568; //Excel-Datum im Zahlenformat umwandeln in Datum 1 = 1.1.1900 if (preg_match("/^\d+$/", $value) && intval($value) > 0) $value = date('Y-m-d', (strtotime('1970-01-01 12:00:00') + (($value - 25569) * 86400))); echo $value."<br>";
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