Textbox text to accept Time format

you use the custom validation for date validation or regularexpression validator for enter time in correct form you write java script for time validation which bind with coutom validation:

<pre lang="cs"><script type="text/javascript">
        function validTime(source,args)
        {
        var res=false;
        var orgVAlue=args.Value;
        var hour=orgVAlue.substring(0,2);
        var min=orgVAlue.substring(3,5);
        var sec=orgVAlue.substring(6,8);
        if(orgVAlue.length==0)
        res=false;
        else if(orgVAlue.length>8)
        res=false;
        else
        {
        if((hour>23)||(min>59)||(sec>59))
        res=false;
        else
        res=true;
        }
        args.IsValid=res;
        }
    </script>

now i use with text box like:-

<pre lang="xml"><asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="validTime"
            ControlToValidate="TextBox1" ErrorMessage="Not valid date" SetFocusOnError="True"
            ValidateEmptyText="True"></asp:CustomValidator>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1"
            ErrorMessage="Enter date in dd:mm:ss" SetFocusOnError="True" ValidationExpression="dd:dd:dd"></asp:RegularExpressionValidator><br />
        <asp:Button ID="Button1" runat="server" Text="Button" />

Now you try this above code.

A validator will tell the user when they typed something wrong. To actually stop them typing it, you need to write javascript to parse input as they type. A better idea for time is to have drop downs for hours and for minutes.