JavaScript Code-
<script language="javascript" type="text/javascript">
function isDate(txtDate, separator) {
var aoDate, // needed for creating array and object
ms, // date in milliseconds
month, day, year; // (integer) month, day and year
// if separator is not defined then set '/'
if (separator === undefined) {
separator = '/';
}
// split input date to month, day and year
aoDate = txtDate.split(separator);
// array length should be exactly 3 (no more no less)
if (aoDate.length !== 3) {
return false;
}
// define month, day and year from array (expected format is m/d/yyyy)
// subtraction will cast variables to integer implicitly
month = aoDate[1] - 1; // because months in JS start from 0
day = aoDate[0] - 0;
year = aoDate[2] - 0;
// test year range
if (year < 1000 || year > 3000) {
return false;
}
// convert input date to milliseconds
ms = (new Date(year, month, day)).getTime();
// initialize Date() object from milliseconds (reuse aoDate variable)
aoDate = new Date();
aoDate.setTime(ms);
// compare input date and parts from Date() object
// if difference exists then input date is not valid
if (aoDate.getFullYear() !== year ||
aoDate.getMonth() !== month ||
aoDate.getDate() !== day) {
return false;
}
// date is OK, return true
return true;
}
function checkDate() {
// define date string to test
var dt = document.getElementById('<%=TxtDate.ClientID %>');
var txtDate = document.getElementById('<%=TxtDate.ClientID %>').value;
// check date and print message
if (isDate(txtDate)) {
return true;
}
else {
alert('Invalid date format!');
dt.value = "";
dt.focus();
return false;
}
}
</script>
<asp:TextBox ID="TxtDate" runat="server"OnChange="checkDate();"></asp:TextBox>
<script language="javascript" type="text/javascript">
function isDate(txtDate, separator) {
var aoDate, // needed for creating array and object
ms, // date in milliseconds
month, day, year; // (integer) month, day and year
// if separator is not defined then set '/'
if (separator === undefined) {
separator = '/';
}
// split input date to month, day and year
aoDate = txtDate.split(separator);
// array length should be exactly 3 (no more no less)
if (aoDate.length !== 3) {
return false;
}
// define month, day and year from array (expected format is m/d/yyyy)
// subtraction will cast variables to integer implicitly
month = aoDate[1] - 1; // because months in JS start from 0
day = aoDate[0] - 0;
year = aoDate[2] - 0;
// test year range
if (year < 1000 || year > 3000) {
return false;
}
// convert input date to milliseconds
ms = (new Date(year, month, day)).getTime();
// initialize Date() object from milliseconds (reuse aoDate variable)
aoDate = new Date();
aoDate.setTime(ms);
// compare input date and parts from Date() object
// if difference exists then input date is not valid
if (aoDate.getFullYear() !== year ||
aoDate.getMonth() !== month ||
aoDate.getDate() !== day) {
return false;
}
// date is OK, return true
return true;
}
function checkDate() {
// define date string to test
var dt = document.getElementById('<%=TxtDate.ClientID %>');
var txtDate = document.getElementById('<%=TxtDate.ClientID %>').value;
// check date and print message
if (isDate(txtDate)) {
return true;
}
else {
alert('Invalid date format!');
dt.value = "";
dt.focus();
return false;
}
}
</script>
<asp:TextBox ID="TxtDate" runat="server"OnChange="checkDate();"></asp:TextBox>
