Validate Time field

Hi Experts,

I am using the following CompareValidator to validate my Date field          

 <asp:CompareValidator ID="cvDate" runat="server" ControlToValidate="txtDate" Display="Dynamic" ErrorMessage="Please enter valid Date." Operator="DataTypeCheck" SetFocusOnError="True" Type="Date"></asp:CompareValidator>

.... how do I validate a Time field so that the value is similar to:     11:47 AM ?    
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Ramesh SrinivasTechnical ConsultantCommented:
I takeit Type="Time" does not work?

try this regularexpression validator.

<asp:regularexpressionvalidator id="valtime" runat="server" ErrorMessage="A valid time required." ControlToValidate="YourField" ValidationExpression="(?<Time>^(?:0?[1-9]:[0-5]|1(?=[012])\d:[0-5])\d(?:[ap]m)?)">*</asp:regularexpressionvalidator>

validates 12:00am,01:00pm formats.

hope this helps.

simonm_jpAuthor Commented:
Saleek ... Time is not a type of CompareValidator (in Whidbey) ....

ayha1999 ... thanks for the example, but I am getting "Syntax error in regular expression" when I run it ...
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this should work.

<asp:RegularExpressionValidator id="RegularExpressionValidator1" runat="server" ErrorMessage="Your message" ControlToValidate="TextBox1"

hope this works.


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acceptable formats are

08:00AM, 10:00am, 7:00pm etc.

simonm_jpAuthor Commented:
Perfect. Thanks ayha1999.  :)
simonm_jpAuthor Commented:
Sorry ayha ... it seems it will not allow strings in the ToShortTime() format, such as:

10:32 AM (with the space between '0' and 'AM') it will only accept 10:32AM ... how will I change it so it allows ShortTime format?


you have to use 10:32AM  instead of 10:32 AM. Just play with the regexp and try.

I use the following RegularExpressionValidator in ASP.NET 2.0 with a VB.NET back end.
the validator accepts h:mm or hh:mm plus one or more spaces plus am or pm or a.m. or p.m. or AM or PM or A.M. or P.M.
The code in the background strips the periods from the text before parsing it to a time
There is redundency in the code, but I'd rather ensure the data i receive even if it was submitted by-passing the form itself is valid.
I use an bollean to determin if I should continue processes or not which is the _ExceptionFound variable.

ASP.NET TextBox Control and RegularExpressionValidator Control
<asp:TextBox ID="txtEndTime" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ErrorMessage="Time Is Not Valid. hh:mm AM/PM" ControlToValidate="txtEndTime" ValidationExpression="^(1[0-2]|0[1-9]|[1-9]):[0-5][0-9]\s+([ap]\.?m\.?|[AP]\.?M\.?)" />
 _PostTimeEnd = txtEndTime.Text.Replace(".", "").ToUpper
If DateTime.TryParse(_PostTimeEnd, _TimeEnd) Then
     _PostTimeEnd = _TimeEnd.ToShortTimeString
     _ExceptionFound = True
           Me.lblError.Text = "Hearing End Time Is Not Valid. hh:mm AM/PM"
End If

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