<!-- Original:  Richard Gorremans (RichardG@spiritwolfx.com) -->

<!-- Web Site:  http://www.spiritwolfx.com -->


<!-- This script and many more are available free online at -->

<!-- The JavaScript Source!! http://javascript.internet.com -->


<!-- Begin

// Check browser version

var isNav4 = false, isNav5 = false, isIE4 = false

var strSeperator = "/";

// If you are using any Java validation on the back side you will want to use the / because

// Java date validations do not recognize the dash as a valid date separator.

var vDateType = 3; // Global value for type of date format

//                1 = mm/dd/yyyy

//                2 = yyyy/dd/mm  (Unable to do date check at this time)

//                3 = dd/mm/yyyy

var vYearType = 4; //Set to 2 or 4 for number of digits in the year for Netscape

var vYearLength = 2; // Set to 4 if you want to force the user to enter 4 digits for the year before validating.

var err = 0; // Set the error code to a default of zero

if(navigator.appName == "Netscape") {

if (navigator.appVersion < "5") {

isNav4 = true;

isNav5 = false;

}

else

if (navigator.appVersion > "4") {

isNav4 = false;

isNav5 = true;

   }

}

else {

isIE4 = true;

}

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 (strCheck.indexOf(whichCode) != -1) {

if (isNav4) {

if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >=1)) {

alert("Invalid Date\nPlease Re-Enter");

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\nPlease Re-Enter");

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\nPlease Re-Enter");

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\nPlease Re-Enter");

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\nPlease Re-Enter");

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\nPlease Re-Enter");

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\nPlease Re-Enter");

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\nPlease Re-Enter");

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));

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] = "Ene";

strMonthArray[1] = "Feb";

strMonthArray[2] = "Mar";

strMonthArray[3] = "Abr";

strMonthArray[4] = "May";

strMonthArray[5] = "Jun";

strMonthArray[6] = "Jul";

strMonthArray[7] = "Ago";

strMonthArray[8] = "Sep";

strMonthArray[9] = "Oct";

strMonthArray[10] = "Nov";

strMonthArray[11] = "Dic";

//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;

}