
How to Validate UK Date in JavaScript

<SCRIPT>
function validateDate(dtControl)
{
var input = document.getElementById(dtControl)
var validformat=/^\d{1,2}\/\d{1,2}\/\d{4}$/ //Basic check for format validity
var returnval=false
if (!validformat.test(input.value))
alert('Invalid Date Format. Please correct.')
else{ //Detailed check for valid date ranges
var dayfield=input.value.split("/")[0]
var monthfield=input.value.split("/")[1]
var yearfield=input.value.split("/")[2]
var dayobj = new Date(yearfield, monthfield-1, dayfield)
if ((dayobj.getMonth()+1!=monthfield)||(dayobj.getDate()!=dayfield)||(dayobj.getFullYear()!=yearfield))
alert('Invalid Day, Month, or Year range detected. Please correct.')
else
{
returnval=true
}
}
if (returnval==false) input.focus()
return returnval
}
</SCRIPT>
<input type="text" id="m_txtDate" onBlur="validateDate('m_txtDate')">
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