<?php
function excelDateToDate($readDate){
$phpexcepDate = $readDate-25569; //to offset to Unix epoch
$timestamp = strtotime("+$phpexcepDate days", mktime(0,0,0,1,1,1970) / 1000); return date("d-m-Y", $timestamp); }
echo excelDateToDate(41137);
PD9waHAKCiAgICBmdW5jdGlvbiBleGNlbERhdGVUb0RhdGUoJHJlYWREYXRlKXsKICAgICAgICAkcGhwZXhjZXBEYXRlID0gJHJlYWREYXRlLTI1NTY5OyAvL3RvIG9mZnNldCB0byBVbml4IGVwb2NoCiAgICAgICAgJHRpbWVzdGFtcCA9IHN0cnRvdGltZSgiKyRwaHBleGNlcERhdGUgZGF5cyIsIG1rdGltZSgwLDAsMCwxLDEsMTk3MCkgLyAxMDAwKTsKICAgICAgICByZXR1cm4gZGF0ZSgiZC1tLVkiLCAkdGltZXN0YW1wKTsKICAgIH0KCgplY2hvIGV4Y2VsRGF0ZVRvRGF0ZSg0MTEzNyk7