“Formato de fecha de Excel en PHP” Código de respuesta

Formato de fecha de Excel en PHP

Please use this formula to change from Excel date to Unix date, then you can 
use "gmdate" to get the real date in PHP:

UNIX_DATE = (EXCEL_DATE - 25569) * 86400
  
and to convert from Unix date to Excel date, use this formula:

EXCEL_DATE = 25569 + (UNIX_DATE / 86400)

After putting this formula into a variable, you can get the real date in PHP 
using this example:

$UNIX_DATE = ($EXCEL_DATE - 25569) * 86400;
echo gmdate("d-m-Y H:i:s", $UNIX_DATE);