// JavaScript Document
// 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 = "";
  c = fld.length;
  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 true;
  }
  var 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;
}