Here is the function: function subtractDates($dFecIni, $dFecFin) { $dFecIni = str_replace(“-”, “”, $dFecIni); $dFecFin = str_replace(“-”, “”, $dFecFin); ereg(“([0-9]{2,4})([0-9]{1,2})([0-9]{1,2})”, $dFecIni, $aFecIni); ereg(“([0-9]{2,4})([0-9]{1,2})([0-9]{1,2})”, $dFecFin, $aFecFin); $date1 = mktime(0, 0, 0, $aFecIni[2], $aFecIni[3], $aFecIni[1]); $date2 = mktime(0, 0, 0, $aFecFin[2], $aFecFin[3], $aFecFin[1]); return round(($date2 – $date1) / (60 * 60 * 24)); } Returns the number of [...]