// Date Validation Javascript
// copyright 30th October 2004, by Stephen Chapman
// http://javascript.about.com

// You have permission to copy and use this javascript provided that
// the content of the script is not changed in any way.

// validateDate(date_field,format_field,range_field) 
// You should pass the date field that is tobe validated as 'date_field',
// the 'format_field' should be U, J, or W to indicate the date format and the 
// 'range_field' shoud be A, P, or F to indicate whether all, past or future 
// dates are valid.

// U -> M D Y  
// W -> D M Y  
// J -> Y M D

function stripBlanks(fld) 
{	
	var result = "";
	for (i=0; i<fld.length; i++) 
		if (fld.charAt(i) != " ") 
			result += fld.charAt(i);
	return result;
}

var numb = '0123456789';

function isValid(parm,val) 
{
	if (parm == "") 
		return true;

	for (i=0; i<parm.length; i++) 
	{
		if (val.indexOf(parm.charAt(i),0) == -1)
			return false;
	}
	return true;
}

function isNum(parm) 
{
	return isValid(parm,numb);
}

var mth = new Array('','january','february','march','april','may','june','july','august','september','october','november','december');
var day = new Array(31,28,31,30,31,30,31,31,30,31,30,31);

function validateDate(fld,fmt,rng) 
{
	var dd, mm, yy;var today = new Date;
	var t = new Date;
	fld = stripBlanks(fld);

	if (fld == '') 
		return false;
		
	var d1 = fld.split('\/');
	
	if (d1.length != 3) 
		d1 = fld.split(' ');
		
	if (d1.length != 3) 
		return false;

	if (fmt == 'u' || fmt == 'U') 
	{
		dd = d1[1]; 
		mm = d1[0]; 
		yy = d1[2];
	}
	else if (fmt == 'j' || fmt == 'J') 
	{
		dd = d1[2]; 
		mm = d1[1]; 
		yy = d1[0];
	}
	else if (fmt == 'w' || fmt == 'W')
	{
		dd = d1[0]; 
		mm = d1[1]; 
		yy = d1[2];
	}
	else 
		return false;

	if (dd=="" && mm=="" && yy=="")
		return true;
	else if (dd=="" || mm=="" || yy=="")
		return false;
	
	var n = dd.lastIndexOf('st');
	if (n > -1) 
		dd = dd.substr(0,n);
		
	n = dd.lastIndexOf('nd');
	if (n > -1) 
		dd = dd.substr(0,n);

	n = dd.lastIndexOf('rd');
	if (n > -1) 
		dd = dd.substr(0,n);
		
	n = dd.lastIndexOf('th');
	if (n > -1) 
		dd = dd.substr(0,n);

	n = dd.lastIndexOf(',');
	if (n > -1) 
		dd = dd.substr(0,n);

	n = mm.lastIndexOf(',');
	if (n > -1) 
		mm = mm.substr(0,n);

	if (!isNum(dd)) 
		return false;

	if (!isNum(yy)) 
		return false;

	if (!isNum(mm)) 
	{
		var nn = mm.toLowerCase();
		for (var i=1; i < 13; i++) 
		{
			if (nn == mth[i] || nn == mth[i].substr(0,3)) 
			{
				mm = i; 
				i = 13;
			}
		}
	}

	if (!isNum(mm)) 
		return false;

	dd = parseFloat(dd); 
	mm = parseFloat(mm); 
	yy = parseFloat(yy);

	if (yy < 100) 
		yy += 2000;

	if (yy < 1582 || yy > 4881) 
		return false;

	if (mm == 2 && (yy%400 == 0 || (yy%4 == 0 && yy%100 != 0))) 
		day[mm-1]++;

	if (mm < 1 || mm > 12) 
		return false;

	if (dd < 1 || dd > day[mm-1]) 
		return false;

	t.setDate(dd); t.setMonth(mm-1); t.setFullYear(yy);
	if (rng == 'p' || rng == 'P') 
	{
		if (t > today) 
			return false;
	}
	else if (rng == 'f' || rng == 'F') 
	{
		if (t < today) 
			return false;
	}
	else 
		if (rng != 'a' && rng != 'A') 
			return false;
			
	return true;
}