var minYear=1890;
var maxYear=2008;

function DaysArray(year) {
	for (var i = 1; i <= 12; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) { 
			this[i] = year % 4 == 0 ? 29 : 28;
		}
   } 
   return this
}

function checkDate(m,d,y){
	if (!m.length || !d.length || !y.length) { 
		return "Enter a date.";
	}
	if (d.charAt(0)=="0" && d.length>1) d=d.substring(1)
	if (m.charAt(0)=="0" && m.length>1) m=m.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (y.charAt(0)=="0" && y.length>1) y=y.substring(1)
	}
	month=parseInt(m)
	day=parseInt(d)
	year=parseInt(y)
	var daysInMonth = DaysArray(year)
	if (m.length<1 || month<1 || month>12){
		return "The month entered is invalid";
	}
	if (d.length<1 || day<1 || day>31 || day > daysInMonth[month]){
		return "The day entered is invalid";
	}
	
	if (y.length != 4 || year==0 || year<minYear || year>maxYear){
		return "Please enter a valid 4 digit year between "+minYear+" and "+maxYear;
	}
	return true
}