Reformat date/time entry in nvarchar field

I currently have a field which is 'ExpiresOn' it is a varchar (25)

Sometimes user will enter a date and sometimes something else like "NA".
Problem I had is we added date & time in that field so then it displays in the database as "May 11 2011 12:00AM"

I need a query that will reformat any entry that is a date time with the format above to the following format:  mm/dd/yyyy, using the example above it would be 05/11/2011

Help is greatly appreciated.  Example of entries in my DB attached.

Table name is "Users"
Field name is: "ExpiresOn"
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Deepak ChauhanSQL Server DBACommented:
select convert(varchar(10), ExpiresOn, 103)
from Users
AleksAuthor Commented:
That only made a selection. I need to update the value
AleksAuthor Commented:
Any other ideas ?  It didn't reformat the fields :$
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Vitor MontalvãoMSSQL Senior EngineerCommented:
How are you inserting the date values? Also, there's a record with 'DS'. What that means?
AleksAuthor Commented:
I am not worried about the insert, that was fixed. I want to fix the entries that are already in the database.
Vitor MontalvãoMSSQL Senior EngineerCommented:
Deepak tried to teach you how to fish and you didn't get it but here's the fish:
SET ExpiresOn = CONVERT(VARCHAR(10), ExpiresOn, 103)

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AleksAuthor Commented:
I apologize I am trying to meet a deadline ... let me test this. Ill try and learn how to fish next time around.
AleksAuthor Commented:
I first tried a select with your code but there is a syntax error:

SELECT  UserId ,
FROM    dbo.Users

--- error---

Msg 4145, Level 15, State 1, Line 3
An expression of non-boolean type specified in a context where a condition is expected, near ')'.
Vitor MontalvãoMSSQL Senior EngineerCommented:
Sorry, my fault. Didn't test it.
SET ExpiresOn = CONVERT(VARCHAR(10), ExpiresOn, 103)
WHERE ISDATE(ExpiresOn) = 1

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AleksAuthor Commented:
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Query Syntax

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