var dtCh= "/";
var curdate=new Date();

var minYear=2004;
var maxYear=curdate.getFullYear();



function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
	var days= new Array(12);
	for (var i = 1; i <= n; i++) {
	
		days[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {days[i] = 30}
		if (i==2) { days[i] = 29 }

	

   }
   return days
}

function isDate(dtStr,formObj,ddObj,mmObj,yyObj){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear

	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)

	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}

	if(isInteger(strDay) != true)
	{
		
		alert("Please enter a valid day")
		ddObj.focus();
		return false
	}


	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert(strDay.length+"**");
		alert("Please enter a valid day")
		ddObj.focus();
		return false
	}

	if(isInteger(strMonth) != true)
	{
		alert("Please enter a valid month")
		mmObj.focus();
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		mmObj.focus();
		return false
	}

	if(isInteger(strYr) != true)
	{
		alert("Please enter a valid year")
		yyObj.focus();
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		yyObj.focus();
		return false
	}
return true;
}

function validatereportadate()
{
	retVal = true;
	if(document.SubjectStudyForm.cboRepDateCondn[document.SubjectStudyForm.cboRepDateCondn.selectedIndex].value != "")
	{
		var dtvalFrom = document.SubjectStudyForm.txtFromDateMM.value + '/' + document.SubjectStudyForm.txtFromDateDD.value + '/' + document.SubjectStudyForm.txtFromDateYY.value;
		var dtvalTo = document.SubjectStudyForm.txtToDateMM.value + '/' + document.SubjectStudyForm.txtToDateDD.value + '/' + document.SubjectStudyForm.txtToDateYY.value;
		retvalFrom = isDate(dtvalFrom,document.SubjectStudyForm,document.SubjectStudyForm.txtFromDateDD,document.SubjectStudyForm.txtFromDateMM,document.SubjectStudyForm.txtFromDateYY);
		retvalTo = true;
		if(retvalFrom == true && document.SubjectStudyForm.cboRepDateCondn[document.SubjectStudyForm.cboRepDateCondn.selectedIndex].value == "1")
		{
			retvalTo = isDate(dtvalTo,document.SubjectStudyForm,document.SubjectStudyForm.txtToDateDD,document.SubjectStudyForm.txtToDateMM,document.SubjectStudyForm.txtToDateYY);
		}
			
		if(retvalFrom == false || retvalTo == false)
		{
			retVal = false;
		}
		else if(document.SubjectStudyForm.cboRepDateCondn[document.SubjectStudyForm.cboRepDateCondn.selectedIndex].value == 1)
		{
			var dtvalFrom = document.SubjectStudyForm.txtFromDateYY.value + '/' + document.SubjectStudyForm.txtFromDateMM.value + '/' + document.SubjectStudyForm.txtFromDateDD.value;
			var dtvalTo = document.SubjectStudyForm.txtToDateYY.value + '/' + document.SubjectStudyForm.txtToDateMM.value + '/' + document.SubjectStudyForm.txtToDateDD.value;
			if(dtvalTo<dtvalFrom)
			{
				alert("To Date should be greater than From Date");
				retVal = false;
			}
			
		}
	}
    return retVal;
}

/*function submitformSel(actnurl,wintrgt)
{
	document.SubjectStudyForm.action = actnurl;

	document.SubjectStudyForm.target = wintrgt;

	//retstat = true;
	retstat = validatereportadate();
	if(retstat == true)
	{
		window.open("reports/studyrpt_print.php",'newPD1','height=500 width=700, top=150, left=150, scrollbars=yes, resizable=yes');
	    document.SubjectStudyForm.submit();
	    return true;
	}
	else
	{
		return false;
	}
}*/