//////////////////////// ISDATE TESTS //////////////////////////////

var numb = '0123456789';
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 stripBlanks(fld) {
	var result = "";
	var c=0;
	for (i=0; i<fld.length; i++) {
		if (fld.charAt(i) != " " || c > 0) {
			result += fld.charAt(i);
			if (fld.charAt(i) != " ") c = result.length;
		}
	}
	return result.substr(0,c);
}

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);
}

// fld = string to check
// fmt = d/m/y sequence (U,J or W)
// rng = acceptable range, (p=past, f=future, a=all)
function isDate(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) 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;

	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;
}

////////////////////// ISEMAIL ADDRESS TESTS /////////////////////////////////////

function isEmail(inputstring)
{ 
    var RegexPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/; 
    return RegexPattern.test(inputstring); 
}


/////////////////////// ISTIME TESTS ////////////////////////////////////////////

function isTime(inputstring) {
    var RegexPattern = /^([0-1][0-9]|2[0-3])[:][0-5][0-9]([:][0-5][0-9])?$/;
    return RegexPattern.test(inputstring);
}