// JavaScript Document
function validDate(day, month, year) {
	indicDate=0
	if ( month=="" || day=="" || year=="") { indicDate=1 }
	if ( month=="---" || day=="--" || year=="----") { indicDate=1 }
	if ( month=="0" || day=="0" || year=="0") { indicDate=1 }
	if ( (month==4 || month==6 || month==9 || month==11) && day == 31) { indicDate=1 } // 30 days months
	if (month==2 && (year % 4)!=0 && day > 28) { indicDate=1 } // non bissextile
	if (month==2 && (year % 4)==0 && day > 29) { indicDate=1 } // bissextile
	return(indicDate)	
}