// 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.

function valDateFmt(datefmt) {
myOption = -1;
for (i=0; i<datefmt.length; i++) {
    if (datefmt[i].checked) {myOption = i;}
}
if (myOption == -1) {
    alert("You must select a date format");
    return ' ';
}
return datefmt[myOption].value;
}

function valDateRng(daterng) {
myOption = -1;
for (i=0; i<daterng.length; i++) {
    if (daterng[i].checked) {myOption = i;}
}
if (myOption == -1) {
    alert("You must select a date range");
    return ' ';
}
return daterng[myOption].value;
}

function stripBlanks(fld) {
var result = "";
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);
}

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;
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;
}