How can i edit the Date Difference formula to return a missing data field if one of the dates is missing. Now it returns -2147483648 if a date is missing.
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In a data table this column formula should work:
If( !Is Missing( :Date1 + :Date2 ),
Date Difference( :Date1, :Date2, "Day" )
In a more general (scripting) context, where the date arguments may be expressions I think this approach works:
DD = Expr( Date Difference( Date DMY( 1, 1, Year( Today() ) ), Today(), "Day" ) );
If( Is Missing( Eval( Arg( DD, 1 ) ) ) | Is Missing( Eval( Arg( DD, 2 ) ) ),
The first option worked perfectly when I pasted it into the formula box. I got the missing data dot for lines with missing dates. Excellent.