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Validating dates in format dd MMM yyyy

Posted on 2004-10-04
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Last Modified: 2012-06-27
I am writing an app that will be accessed by UK and US users, so date input is tricky. I decided to enforce date input in the format dd MMM yyyy (eg 05 Oct 2004) as it is unambiguous. I used a regular expression validator to check for 2 digits, a space, 3 alpha, a space, 4 digits. That bit works. But when I use a RangeValidator to check it is a valid date, so that people don't input 99 XYZ 1234, it fails even on 'valid' dates.

Any suggestions how I can handle UK and US date input?
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Question by:crescendo
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Author Comment

by:crescendo
ID: 12222268
Sorry, I meant a CompareValidator, not a RangeValidator.
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by:surajguptha
ID: 12224091
Can u add the regular expression for clarity?
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by:boulder_bum
ID: 12224321
Maybe a globalization settings issue?

If all else fails, I suppose you can use two Regex validators. Inelegant, perhaps, but it should work.
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LVL 9

Author Comment

by:crescendo
ID: 12224511
I think I wasn't clear.

The RegEx works, so I can validate the general format. BUT... I still need to check that the month names and number of days in the month are valid, e.g. not allow 29 Feb 2003. I hoped the CompareValidator, set to check a date data type, would do this, but it complains because it presumably expects 30/11/2004 (UK) format dates, not 30 Nov 2004.

I can't change the regional settings because there are other webs on the server and it might affect them.
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Expert Comment

by:surajguptha
ID: 12224550
Why dont you try writing a java script for the same to validate the dates?
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by:crescendo
ID: 12224651
<<Why dont you try writing a java script for the same to validate the dates?>>

I was assuming that I wasn't the first person in the universe to have to accept and validate dates from both UK and US users, so there must be a solution out there which would save me doing all the work myself.

I'll write it in server-side code.

Thanks

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Expert Comment

by:surajguptha
ID: 12224688
Just a suggestion: Why dont you use a dropdown for the months to enforce MMM or may be months and years?
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Author Comment

by:crescendo
ID: 12224717
I'd still have the same problem of validating the number of days in each month.

I'm just surprised that the CompareValidator doesn't allow this format. Perhaps it only allows the format set on the regional settings, so if I set that it would work. But, as I said above, that would break other apps.
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Expert Comment

by:boulder_bum
ID: 12224949
I believe you can handle the System.Globalization issues on a more local level. This may help, may not. I haven't really had to deal with this issue before.

DateTimeFormatInfo Class
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemglobalizationdatetimeformatinfoclasstopic.asp

Once America takes over THE REST of the world, this won't be so much of an issue. Metric system be damned.

I wouldn't be surprised if you can tweak the culture settings for the validator.
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dabitbol earned 1000 total points
ID: 12228030
I had the same problem than you and just used a calendar control. I think it's the simplest way. You can make as a pop-up calendar that inputs that date in read-only textbox.

David
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by:dabitbol
ID: 12229981
glad I could help!
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