Set working days to zero if the end date is blank.

[KasSamrari]

Hello,

I am working on an access dB where the release date is only populated once the products have been released otherwise remain blank. I can calculate the working days if the MfgDate and FFReleaseDate are both populated but get an #error if the FFReleaseDate is blank. I would like the working days to be zero if the release date field is blank. Doing this with vba code (Attached). Please help.

Regards,
Kas

[Stewart Ross]

Hi. Problem is that you are defining the type of parameter FFReleaseDate as a Date type. This is not compatible with passing in a Null value.

You will need to redefine the parameter as a Variant, and test for null explicitly

Public Function Workdays(...,  ByVal FFReleaseDate as Variant, ...

' Add test before other lines in main body
If IsNull(FFReleaseDate) then
  Workdays = 0
  Exit Function
end if

As you are not changing the value of FFReleaseDate there is no need to pass it by reference. I have changed ByRef to ByVal above accordingly.

-Stewart