<!-- TWO STEPS TO INSTALL VALIDATE DATE:
1. Copy the coding into the HEAD of your HTML document
2. Add the last code into the BODY of your HTML document -->
<!-- STEP ONE: Paste this code into the HEAD of your HTML document -->
<HEAD>
<SCRIPT LANGUAGE=
"JavaScript">
<!-- This script
and many more are available free online at -->
<!-- The JavaScript Source!! http:
//javascript.internet.com -->
<!-- Original: Torsten Frey
(tf@tfrey.de
) -->
<!-- Web Site: http:
//www.tfrey.de -->
<!-- Begin
function check_date
(field
){
var checkstr =
"0123456789";
var DateField = field;
var Datevalue =
"";
var DateTemp =
"";
var seperator =
".";
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
err = 0;
DateValue = DateField.value;
/* Delete all chars except 0..9 */
for (i = 0; i < DateValue.length; i++
) {
if (checkstr.indexOf
(DateValue.substr
(i,1
)) >= 0
) {
DateTemp = DateTemp + DateValue.substr
(i,1
);
}
}
DateValue = DateTemp;
/* Always change date to 8 digits - string*/
/* if year is entered as 2-digit / always assume 20xx */
if (DateValue.length == 6
) {
DateValue = DateValue.substr
(0,4
) +
'20' + DateValue.substr
(4,2
);
}
if (DateValue.length != 8
) {
err = 19;
}
/* year is wrong if year = 0000 */
year = DateValue.substr
(4,4
);
if (year == 0
) {
err = 20;
}
/* Validation of month*/
month = DateValue.substr
(2,2
);
if ((month < 1
) ||
(month > 12
)) {
err = 21;
}
/* Validation of day*/
day = DateValue.substr
(0,2
);
if (day < 1
) {
err = 22;
}
/* Validation leap-year / february / day */
if ((year % 4 == 0
) ||
(year % 100 == 0
) ||
(year % 400 == 0
)) {
leap = 1;
}
if ((month == 2
) &&
(leap == 1
) &&
(day > 29
)) {
err = 23;
}
if ((month == 2
) &&
(leap != 1
) &&
(day > 28
)) {
err = 24;
}
/* Validation of other months */
if ((day > 31
) &&
((month ==
"01") ||
(month ==
"03") ||
(month ==
"05") ||
(month ==
"07") ||
(month ==
"08") ||
(month ==
"10") ||
(month ==
"12"))) {
err = 25;
}
if ((day > 30
) &&
((month ==
"04") ||
(month ==
"06") ||
(month ==
"09") ||
(month ==
"11"))) {
err = 26;
}
/* if 00 ist entered, no error, deleting the entry */
if ((day == 0
) &&
(month == 0
) &&
(year == 00
)) {
err = 0; day =
""; month =
""; year =
""; seperator =
"";
}
/* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
if (err == 0
) {
DateField.value = day + seperator + month + seperator + year;
}
/* Error-message if err != 0 */
else {
alert
("Date is incorrect!");
DateField.select
();
DateField.focus
();
}
}
// End -->
</script>
</HEAD>
<!-- STEP TWO: Copy this code into the BODY of your HTML document -->
<BODY>
<CENTER>
<FORM name=
"datecheck">
<TABLE border=
"0" width=
"60%">
<TR>
<TD>
Enter Date
(Use European format shown at right
)<P>
<INPUT type=
"text" name=testdat size=
'10' maxlength=
"10" onblur=
"check_date(this)">
<INPUT type=
"submit" name=
"button" value=
"Press to Validate"><p>
(Date is validated after leaving the field.
)
</TD>
<TD>
<b>ddmmyy</b>
(171201
) or <BR>
<b>ddmmyyyy</b>
(17122001
) or <BR>
<b>ddXmmXyy</b>
(17-12-01
or 17y12q01 ...
) or <BR>
<b>ddXmmXyyyy</b>
(17.12.2001
or 17,12,2001 ...
) <br>
where
"X" is any sign not in 0..9, i.e.
"-" or "/"<p>
</TD>
</TR>
</TABLE>
</FORM>
</CENTER>
