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copied!<p>You don't need to use regular expressions, use <code>DateTime.TryParse</code> or <code>DateTime.TryParseExact</code> instead. I recommend using the regular <code>TryParse</code> method because it affords your visitors flexibility in their formats (e.g. some visitors might want to use the 24-hour system, whereas others can use the 12-hour system).</p> <pre><code>String input; DateTime dt; if( !DateTime.TryParse( input, CultureInfo.InvariantCulture /* change if appropriate */, DateTimeStyles.None, out dt ) ) { // show error message } </code></pre> <p>Now as you're using a validator, you'll want to wrap up this logic in a <code>Validator</code> subclass, but it's really easy:</p> <pre><code>public class DateTimeValidator : BaseValidator { protected override bool EvaluateIsValid() { String controlValidationValue = base.GetControlValidationValue(base.ControlToValidate); if( String.IsNullOrEmpty( controlValidationValue ) ) return true; DateTime dt; return DateTime.TryParse( input, CultureInfo.InvariantCulture /* change if appropriate */, DateTimeStyles.None, out dt ); } } </code></pre> <p>Then (assuming you've registered a tag-prefix in <code>web.config</code>) all you need to do is this:</p> <pre><code><label> Enter a valid date/time value. <input type="text" runat="server" id="someDate" /> <myprefix:DateTimeValidator runat="server" controlToValidate="someDate" /> </label> </code></pre> <p>You will need a separate <code><asp:RequiredFieldValidator></code> if you want the field to be required.</p>

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