Thread: JavaScript date time validation

I am developing one window based application. In that application I have a JavaScript datetime picker calendar and a textbox. I want to validate the date and time both if the user not select date and message it will show pop message. Also I want to check if the date time entered in the textbox is in correct format through javascript?

Have you tried below code to JavaScript datetime validation? If not then try this code:

Code:

<script type="text/javascript" language="JavaScript">
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 != {
err = 19;}
/* year is wrong if year = 0000 */
year = DateValue.substr(4,4);
if (year == 0) {
err = 20;
}
/* Validation of month*/
month = DateValue.substr(0,2);
if ((month < 1) || (month > 12)) {
err = 21;
}
/* Validation of day*/
day = DateValue.substr(2,2);
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 > 2) {
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>