Ahh, dont worry. Ive found a way.

Basic Steps to enable this of client side ( Per Text Input )  is this.

1.) Handle GridView1_RowDataBound

2.) Find and cast the required textbox to a textbox.

3.) Add an attribute("onkeypress","yourDateFormatValidationFunction");

I still need to validate on the server that the actual date exists, but
thats not going to be too troublesome.

Cheers

Hi

Use a CompareValidator control for a client-side check prior to
postback. Set the 'operator' (properties window) property to
DataTypeCheck. You can use this in conjunction with a RangeValidator
to filter on the required period if applicable.

Unfortunately there is no way to guarantee day/month v month/day
ambiguity for text input. Most web sites that require date input use
drop-down lists for day and month instead.

Alternatively use the ASP.NET calendar control. They require more
space on the page and can generate a lot of round trips during the
selection process but are user friendly and easy to work with on the
development side.

HTH