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   /*$RCSfile: validateDate.js,v $ $Rev: 239517 $ $Date: 2005-08-24 04:48:03 +0100 (Wed, 24 Aug 2005) $ */
    /**
    * Check to see if fields are a valid date.
    * Fields are not checked if they are disabled.
    * <p>
    * @param form The form validation is taking place on.
    */
    function validateDate(form) {
       var bValid = true;
       var focusField = null;
       var i = 0;
       var fields = new Array();
 
       oDate = eval('new ' + retrieveFormName(form) +  '_DateValidations()');

       for (x in oDate) {
           var field = form[oDate[x][0]];
           var value = field.value;
           var isStrict = true;
           var datePattern = oDate[x][2]("datePatternStrict");
           // try loose pattern
           if (datePattern == null) {
               datePattern = oDate[x][2]("datePattern");
               isStrict = false;
           }    
           if ((field.type == 'hidden' ||
                field.type == 'text' ||
                field.type == 'textarea') &&
               (value.length > 0) && (datePattern.length > 0) &&
                field.disabled == false) {
                 var MONTH = "MM";
                 var DAY = "dd";
                 var YEAR = "yyyy";
                 var orderMonth = datePattern.indexOf(MONTH);
                 var orderDay = datePattern.indexOf(DAY);
                 var orderYear = datePattern.indexOf(YEAR);
                 if ((orderDay < orderYear && orderDay > orderMonth)) {
                     var iDelim1 = orderMonth + MONTH.length;
                     var iDelim2 = orderDay + DAY.length;
                     var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
                     var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
                     if (iDelim1 == orderDay && iDelim2 == orderYear) {
                        dateRegexp = isStrict 
                             ? new RegExp("^(\\d{2})(\\d{2})(\\d{4})$") 
                             : new RegExp("^(\\d{1,2})(\\d{1,2})(\\d{4})$");
                     } else if (iDelim1 == orderDay) {
                        dateRegexp = isStrict 
                             ? new RegExp("^(\\d{2})(\\d{2})[" + delim2 + "](\\d{4})$")
                             : new RegExp("^(\\d{1,2})(\\d{1,2})[" + delim2 + "](\\d{4})$");
                     } else if (iDelim2 == orderYear) {
                        dateRegexp = isStrict
                             ? new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})(\\d{4})$")
                             : new RegExp("^(\\d{1,2})[" + delim1 + "](\\d{1,2})(\\d{4})$");
                     } else {
                        dateRegexp = isStrict
                             ? new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{4})$")
                             : new RegExp("^(\\d{1,2})[" + delim1 + "](\\d{1,2})[" + delim2 + "](\\d{4})$");
                     }
                     var matched = dateRegexp.exec(value);
                     if(matched != null) {
                        if (!isValidDate(matched[2], matched[1], matched[3])) {
                           if (i == 0) {
                               focusField = field;
                           }
                           fields[i++] = oDate[x][1];
                           bValid =  false;
                        }
                     } else {
                        if (i == 0) {
                            focusField = field;
                        }
                        fields[i++] = oDate[x][1];
                        bValid =  false;
                     }
                 } else if ((orderMonth < orderYear && orderMonth > orderDay)) {
                     var iDelim1 = orderDay + DAY.length;
                     var iDelim2 = orderMonth + MONTH.length;
                     var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
                     var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
                     if (iDelim1 == orderMonth && iDelim2 == orderYear) {
                         dateRegexp = isStrict 
                            ? new RegExp("^(\\d{2})(\\d{2})(\\d{4})$")
                            : new RegExp("^(\\d{1,2})(\\d{1,2})(\\d{4})$");
                     } else if (iDelim1 == orderMonth) {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{2})(\\d{2})[" + delim2 + "](\\d{4})$")
                            : new RegExp("^(\\d{1,2})(\\d{1,2})[" + delim2 + "](\\d{4})$");
                     } else if (iDelim2 == orderYear) {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})(\\d{4})$")
                            : new RegExp("^(\\d{1,2})[" + delim1 + "](\\d{1,2})(\\d{4})$");
                     } else {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{4})$")
                            : new RegExp("^(\\d{1,2})[" + delim1 + "](\\d{1,2})[" + delim2 + "](\\d{4})$");
                     }
                     var matched = dateRegexp.exec(value);
                     if(matched != null) {
                         if (!isValidDate(matched[1], matched[2], matched[3])) {
                             if (i == 0) {
                                  focusField = field;
                             }
                             fields[i++] = oDate[x][1];
                             bValid =  false;
                          }
                     } else {
                         if (i == 0) {
                             focusField = field;
                         }
                         fields[i++] = oDate[x][1];
                         bValid =  false;
                     }
                 } else if ((orderMonth > orderYear && orderMonth < orderDay)) {
                     var iDelim1 = orderYear + YEAR.length;
                     var iDelim2 = orderMonth + MONTH.length;
                     var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
                     var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
                     if (iDelim1 == orderMonth && iDelim2 == orderDay) {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{4})(\\d{2})(\\d{2})$")
                            : new RegExp("^(\\d{4})(\\d{1,2})(\\d{1,2})$");
                     } else if (iDelim1 == orderMonth) {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{4})(\\d{2})[" + delim2 + "](\\d{2})$")
                            : new RegExp("^(\\d{4})(\\d{1,2})[" + delim2 + "](\\d{1,2})$");
                     } else if (iDelim2 == orderDay) {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{4})[" + delim1 + "](\\d{2})(\\d{2})$")
                            : new RegExp("^(\\d{4})[" + delim1 + "](\\d{1,2})(\\d{1,2})$");
                     } else {
                         dateRegexp = isStrict
                            ? new RegExp("^(\\d{4})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{2})$")
                            : new RegExp("^(\\d{4})[" + delim1 + "](\\d{1,2})[" + delim2 + "](\\d{1,2})$");
                     }
                     var matched = dateRegexp.exec(value);
                     if(matched != null) {
                         if (!isValidDate(matched[3], matched[2], matched[1])) {
                             if (i == 0) {
                                 focusField = field;
                             }
                             fields[i++] = oDate[x][1];
                             bValid =  false;
                         }
                     } else {
                          if (i == 0) {
                              focusField = field;
                          }
                          fields[i++] = oDate[x][1];
                          bValid =  false;
                     }
                 } else {
                     if (i == 0) {
                         focusField = field;
                     }
                     fields[i++] = oDate[x][1];
                     bValid =  false;
                 }
          }
       }
       if (fields.length > 0) {
          focusField.focus();
          alert(fields.join('\n'));
       }
       return bValid;
    }
    
    function isValidDate(day, month, year) {
	    if (month < 1 || month > 12) {
            return false;
        }
        if (day < 1 || day > 31) {
            return false;
        }
        if ((month == 4 || month == 6 || month == 9 || month == 11) &&
            (day == 31)) {
            return false;
        }
        if (month == 2) {
            var leap = (year % 4 == 0 &&
               (year % 100 != 0 || year % 400 == 0));
            if (day>29 || (day == 29 && !leap)) {
                return false;
            }
        }
        return true;
    }
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