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 I have an data item in my table which is of type varchar but it is a date value

Birthdate=10212010

and also I have some zero values in the table for this dataitem. I am trying to change the format of the birthdate from char (10212010) to date( Oct 21,2010) as per the requirements

Is there any way Can i change the zero value data item to null value.

Because when I am trying to change the data item(00000000) to date  It gives me an error saying that it is not a valid

try this query calculation
if ( [date]=0 ) then
(null)
else
([Date])

then try function  to remove null values or show text u want for null values  coalesce ([Date],'NA')

Thanks..It worked