function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) {
    vDateType = dateType;
    // vDateName = object name
    // vDateValue = value in the field being checked
    // e = event
    // dateCheck 
    // True  = Verify that the vDateValue is a valid date
    // False = Format values being entered into vDateValue only
    // vDateType
    // 1 = mm/dd/yyyy
    // 2 = yyyy/mm/dd
    // 3 = dd/mm/yyyy
    //Enter a tilde sign for the first number and you can check the variable information.
    if (vDateValue == "~") {
        alert("AppVersion = " + navigator.appVersion + " \nNav. 4 Version = " + isNav4 + " \nNav. 5 Version = " + isNav5 + " \nIE Version = " + isIE4 + " \nYear Type = " + vYearType + " \nDate Type = " + vDateType + " \nSeparator = " + strSeperator);
        vDateName.value = "";
        vDateName.focus();
        return true;
    }
    var whichCode = (window.Event) ? e.which : e.keyCode;
    // Check to see if a seperator is already present.
    // bypass the date if a seperator is present and the length greater than 8
    if (vDateValue.length > 8 && isNav4) {
        if ((vDateValue.indexOf("-") >= 1) || (vDateValue.indexOf("/") >= 1))
            return true;
    }
    //Eliminate all the ASCII codes that are not valid
    var alphaCheck = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/-";
    if (alphaCheck.indexOf(vDateValue) >= 1) {
        if (isNav4) {
            vDateName.value = "";
            vDateName.focus();
            vDateName.select();
            return false;
        }
        else {
            vDateName.value = vDateName.value.substr(0, (vDateValue.length - 1));
            return false;
        }
    }
    if (whichCode == 8) //Ignore the Netscape value for backspace. IE has no value
        return false;
    else {
        //Create numeric string values for 0123456789/
        //The codes provided include both keyboard and keypad values
        var strCheck = '47,48,49,50,51,52,53,54,55,56,57,58,59,95,96,97,98,99,100,101,102,103,104,105';
        if (whichCode == undefined || strCheck.indexOf(whichCode) != -1) {
            if (isNav4) {
                if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >= 1)) {
                    alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                    vDateName.value = "";
                    vDateName.focus();
                    vDateName.select();
                    return false;
                }
                if (vDateValue.length == 6 && dateCheck) {
                    var mDay = vDateName.value.substr(2, 2);
                    var mMonth = vDateName.value.substr(0, 2);
                    var mYear = vDateName.value.substr(4, 4)
                    //Turn a two digit year into a 4 digit year
                    if (mYear.length == 2 && vYearType == 4) {
                        var mToday = new Date();
                        //If the year is greater than 30 years from now use 19, otherwise use 20
                        var checkYear = mToday.getFullYear() + 30;
                        var mCheckYear = '20' + mYear;
                        if (mCheckYear >= checkYear)
                            mYear = '19' + mYear;
                        else
                            mYear = '20' + mYear;
                    }
                    var vDateValueCheck = mMonth + strSeperator + mDay + strSeperator + mYear;
                    if (!dateValid(vDateValueCheck)) {
                        alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                        vDateName.value = "";
                        vDateName.focus();
                        vDateName.select();
                        return false;
                    }
                    return true;
                }
                else {
                    // Reformat the date for validation and set date type to a 1
                    if (vDateValue.length >= 8 && dateCheck) {
                        if (vDateType == 1) // mmddyyyy
                        {
                            var mDay = vDateName.value.substr(2, 2);
                            var mMonth = vDateName.value.substr(0, 2);
                            var mYear = vDateName.value.substr(4, 4)
                            vDateName.value = mMonth + strSeperator + mDay + strSeperator + mYear;
                        }
                        if (vDateType == 2) // yyyymmdd
                        {
                            var mYear = vDateName.value.substr(0, 4)
                            var mMonth = vDateName.value.substr(4, 2);
                            var mDay = vDateName.value.substr(6, 2);
                            vDateName.value = mYear + strSeperator + mMonth + strSeperator + mDay;
                        }
                        if (vDateType == 3) // ddmmyyyy
                        {
                            var mMonth = vDateName.value.substr(2, 2);
                            var mDay = vDateName.value.substr(0, 2);
                            var mYear = vDateName.value.substr(4, 4)
                            vDateName.value = mDay + strSeperator + mMonth + strSeperator + mYear;
                        }
                        //Create a temporary variable for storing the DateType and change
                        //the DateType to a 1 for validation.
                        var vDateTypeTemp = vDateType;
                        vDateType = 1;
                        var vDateValueCheck = mMonth + strSeperator + mDay + strSeperator + mYear;
                        if (!dateValid(vDateValueCheck)) {
                            alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                            vDateType = vDateTypeTemp;
                            vDateName.value = "";
                            vDateName.focus();
                            vDateName.select();
                            return false;
                        }
                        vDateType = vDateTypeTemp;
                        return true;
                    }
                    else {
                        if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >= 1)) {
                            alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                            vDateName.value = "";
                            vDateName.focus();
                            vDateName.select();
                            return false;
                        }
                    }
                }
            }
            else {
                // Non isNav Check
                if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >= 1)) {
                    alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                    vDateName.value = "";
                    vDateName.focus();
                    return true;
                }
                // Reformat date to format that can be validated. mm/dd/yyyy
                if (vDateValue.length >= 8 && dateCheck) {
                    // Additional date formats can be entered here and parsed out to
                    // a valid date format that the validation routine will recognize.
                    if (vDateType == 1) // mm/dd/yyyy
                    {
                        var mMonth = vDateName.value.substr(0, 2);
                        var mDay = vDateName.value.substr(3, 2);
                        var mYear = vDateName.value.substr(6, 4)
                    }
                    if (vDateType == 2) // yyyy/mm/dd
                    {
                        var mYear = vDateName.value.substr(0, 4)
                        var mMonth = vDateName.value.substr(5, 2);
                        var mDay = vDateName.value.substr(8, 2);
                    }
                    if (vDateType == 3) // dd/mm/yyyy
                    {
                        var mDay = vDateName.value.substr(0, 2);
                        var mMonth = vDateName.value.substr(3, 2);
                        var mYear = vDateName.value.substr(6, 4)
                    }
                    if (vYearLength == 4) {
                        if (mYear.length < 4) {
                            alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                            vDateName.value = "";
                            vDateName.focus();
                            return true;
                        }
                    }
                    // Create temp. variable for storing the current vDateType
                    var vDateTypeTemp = vDateType;
                    // Change vDateType to a 1 for standard date format for validation
                    // Type will be changed back when validation is completed.
                    vDateType = 1;
                    // Store reformatted date to new variable for validation.
                    var vDateValueCheck = mMonth + strSeperator + mDay + strSeperator + mYear;
                    if (mYear.length == 2 && vYearType == 4 && dateCheck) {
                        //Turn a two digit year into a 4 digit year
                        var mToday = new Date();
                        //If the year is greater than 30 years from now use 19, otherwise use 20
                        var checkYear = mToday.getFullYear() + 30;
                        var mCheckYear = '20' + mYear;
                        if (mCheckYear >= checkYear)
                            mYear = '19' + mYear;
                        else
                            mYear = '20' + mYear;
                        vDateValueCheck = mMonth + strSeperator + mDay + strSeperator + mYear;
                        // Store the new value back to the field.  This function will
                        // not work with date type of 2 since the year is entered first.
                        if (vDateTypeTemp == 1) // mm/dd/yyyy
                            vDateName.value = mMonth + strSeperator + mDay + strSeperator + mYear;
                        if (vDateTypeTemp == 3) // dd/mm/yyyy
                            vDateName.value = mDay + strSeperator + mMonth + strSeperator + mYear;
                    }
                    if (!dateValid(vDateValueCheck)) {
                        alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                        vDateType = vDateTypeTemp;
                        vDateName.value = "";
                        vDateName.focus();
                        return true;
                    }
                    vDateType = vDateTypeTemp;
                    return true;
                }
                else {
                    if (vDateType == 1) {
                        if (vDateValue.length == 2) {
                            vDateName.value = vDateValue + strSeperator;
                        }
                        if (vDateValue.length == 5) {
                            vDateName.value = vDateValue + strSeperator;
                        }
                    }
                    if (vDateType == 2) {
                        if (vDateValue.length == 4) {
                            vDateName.value = vDateValue + strSeperator;
                        }
                        if (vDateValue.length == 7) {
                            vDateName.value = vDateValue + strSeperator;
                        }
                    }
                    if (vDateType == 3) {
                        if (vDateValue.length == 2) {
                            vDateName.value = vDateValue + strSeperator;
                        }
                        if (vDateValue.length == 5) {
                            vDateName.value = vDateValue + strSeperator;
                        }
                    }
                    return true;
                }
            }
            if (vDateValue.length == 10 && dateCheck) {
                if (!dateValid(vDateName)) {
                    // Un-comment the next line of code for debugging the dateValid() function error messages
                    //alert(err);  
                    alert("Invalid Date format\nPlease Re-Enter date in DD/MM/YYYY format");
                    vDateName.focus();
                    vDateName.select();
                }
            }
            return false;
        }
        else {
            // If the value is not in the string return the string minus the last
            // key entered.
            if (isNav4) {
                vDateName.value = "";
                vDateName.focus();
                vDateName.select();
                return false;
            }
            else {
                vDateName.value = vDateName.value.substr(0, (vDateValue.length - 1));
                return false;
            }
        }
    }
}
function dateValid(objName) {
    var strDate;
    var strDateArray;
    var strDay;
    var strMonth;
    var strYear;
    var intday;
    var intMonth;
    var intYear;
    var booFound = false;
    var datefield = objName;
    var strSeparatorArray = new Array("-", " ", "/", ".");
    var intElementNr;
    // var err = 0;
    var strMonthArray = new Array(12);
    strMonthArray[0] = "Jan";
    strMonthArray[1] = "Feb";
    strMonthArray[2] = "Mar";
    strMonthArray[3] = "Apr";
    strMonthArray[4] = "May";
    strMonthArray[5] = "Jun";
    strMonthArray[6] = "Jul";
    strMonthArray[7] = "Aug";
    strMonthArray[8] = "Sep";
    strMonthArray[9] = "Oct";
    strMonthArray[10] = "Nov";
    strMonthArray[11] = "Dec";
    //strDate = datefield.value;
    strDate = objName;
    if (strDate.length < 1) {
        return true;
    }
    for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
        if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
            strDateArray = strDate.split(strSeparatorArray[intElementNr]);
            if (strDateArray.length != 3) {
                err = 1;
                return false;
            }
            else {
                strDay = strDateArray[0];
                strMonth = strDateArray[1];
                strYear = strDateArray[2];
            }
            booFound = true;
        }
    }
    if (booFound == false) {
        if (strDate.length > 5) {
            strDay = strDate.substr(0, 2);
            strMonth = strDate.substr(2, 2);
            strYear = strDate.substr(4);
        }
    }
    //Adjustment for short years entered
    if (strYear.length == 2) {
        strYear = '20' + strYear;
    }
    strTemp = strDay;
    strDay = strMonth;
    strMonth = strTemp;
    intday = parseInt(strDay, 10);
    if (isNaN(intday)) {
        err = 2;
        return false;
    }
    intMonth = parseInt(strMonth, 10);
    if (isNaN(intMonth)) {
        for (i = 0; i < 12; i++) {
            if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
                intMonth = i + 1;
                strMonth = strMonthArray[i];
                i = 12;
            }
        }
        if (isNaN(intMonth)) {
            err = 3;
            return false;
        }
    }
    intYear = parseInt(strYear, 10);
    if (isNaN(intYear)) {
        err = 4;
        return false;
    }
    if (intMonth > 12 || intMonth < 1) {
        err = 5;
        return false;
    }
    if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
        err = 6;
        return false;
    }
    if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
        err = 7;
        return false;
    }
    if (intMonth == 2) {
        if (intday < 1) {
            err = 8;
            return false;
        }
        if (LeapYear(intYear) == true) {
            if (intday > 29) {
                err = 9;
                return false;
            }
        }
        else {
            if (intday > 28) {
                err = 10;
                return false;
            }
        }
    }
    return true;
}
function LeapYear(intYear) {
    if (intYear % 100 == 0) {
        if (intYear % 400 == 0) { return true; }
    }
    else {
        if ((intYear % 4) == 0) { return true; }
    }
    return false;
}