This i DID at javascipt..
function ChechDate(txtdate, txtdateto) {
if (txtdate > new Date('1/1/1753 12:00:00 AM') &&
txtdateto < new Date('12/31/9999 11:59:59 PM')) {
return true;
} else {
return false;
}
And at textbox i wrote onkeyup="CheckDate (this);"