Copy only dates

Posted on 2016-09-18
Last Modified: 2016-09-18
I am trying to make NULL fields that are not dates, date should only be either:

mm/dd/yyyy  OR mm/dd/yy

Anything that is not that format should be made NULL

Here is my current sql

UPDATE  dbo.Dependents SET DepLastUSEntry = NULL 

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It is not making some of the fields NULL not sure why.  Perhaps it is allowing some 'dates' that are not in the format above, is there a way to check that it IS in the format as listed above ?
Question by:amucinobluedot
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LVL 28

Expert Comment

by:Pawan Kumar
ID: 41804131
Here you go


UPDATE  dbo.Dependents SET DepLastUSEntry = NULL 
WHERE ISDATE(FORMAT(DepLastUSEntry,'mm/dd/yyyy'))= 0


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Pls let me know if you face any issues
LVL 28

Accepted Solution

Pawan Kumar earned 500 total points
ID: 41804134
If above dont work then you write 2 statements


UPDATE  dbo.Dependents SET DepLastUSEntry = NULL 
WHERE ISDATE(FORMAT(DepLastUSEntry,'mm/dd/yyyy'))= 0

UPDATE  dbo.Dependents SET DepLastUSEntry = NULL 
WHERE ISDATE(FORMAT(DepLastUSEntry,'mm/dd/yy'))= 0


Open in new window


Author Closing Comment

ID: 41804146

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