Military time

I need a textbox that except military time only. Should I use datetime.now.tostring(format...? Thank you in advance.
For example right now is 9:10 pm - military time is  2110
VBdotnet2005Asked:
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Sinoj SebastianConnect With a Mentor CTO & OpenERP Project managerCommented:
I've used RegularExpressionValidator in the above code. If client is java script enabled, then if validation failed the page will not post back. You can use "if page.isvalid then" to confirm that user input is correct.

    Private Sub BtnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSubmit.Click
        If Page.IsValid Then
            Dim a As Char() = Trim(TBTime.Text).ToCharArray()
            TBTime.Text() = Date.Parse(a(0) + a(1) + ":" + a(2) + a(3)).ToShortTimeString
        End If
    End Sub

see the following link for further details
http://msdn2.microsoft.com/en-us/library/eahwtc9e.aspx

One problem with RegularExpressionValidator is that it will accept null string also. So, you may need  RequiredFieldValidator also.

Sorry
I'm late late. Tomorrow is sunday. I can give more detailed information day after tomorrow.
If you need further help, just drop a comment.

PS: I'm at GMT+05:30. Its 10PM now.
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Sinoj SebastianCTO & OpenERP Project managerCommented:
Try this

<asp:TextBox id="TBTime" style="Z-INDEX: 101; LEFT: 128px; POSITION: absolute; TOP: 152px" runat="server"></asp:TextBox>
                  <asp:RegularExpressionValidator id="RegularExpressionValidator1" style="Z-INDEX: 102; LEFT: 296px; POSITION: absolute; TOP: 152px"
                        runat="server" ErrorMessage="Invalid Time" ValidationExpression="(([01][0-9])|(2[0-3]))[0-5][0-9]" ControlToValidate="TBTime"></asp:RegularExpressionValidator>
                  <asp:Button id="BtnSubmit" style="Z-INDEX: 103; LEFT: 208px; POSITION: absolute; TOP: 192px"
                        runat="server" Text="Test" Width="72px"></asp:Button>
                  <asp:Label id="Label1" style="Z-INDEX: 104; LEFT: 56px; POSITION: absolute; TOP: 152px" runat="server">Enter time</asp:Label>

Tell me if you have any problem.
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VBdotnet2005Author Commented:
If a user input 0651, for example, how can you tell whether it is am or pm, for those whom is not awared of it? Since it excepts it anyway.
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Sinoj SebastianCTO & OpenERP Project managerCommented:
I'm sorry, i don't understand what you are taking about.

0000 - 1159 is AM
1200 - 2359 is PM

try this
    Private Sub BtnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSubmit.Click
        Dim Time As Date
        Dim a As Char() = Trim(TBTime.Text).ToCharArray()
        TBTime.Text() = Date.Parse(a(0) + a(1) + ":" + a(2) + a(3)).ToShortTimeString
    End Sub
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VBdotnet2005Author Commented:
Can you help me further? What is a user accidently input just a number? It is going to create an error, correct?
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