WORKDAY with IF statement results not working as desired

[Yodelayheewho]

I have a WBS file for planning events. It includes a Start Date, End Date and Days (Number of days to complete). The formula in question the End Date Column (Column F) of the attached.
When I enter '0' days to complete a task, i.e., I finish the task in the same day, it still adds a day. So, if I start 04-24-19 and I enter '0' days, instead of returning 04-24-19 as the End Date, it returns 04-25-19. I get the same result if I enter '1' day, which makes sense.

 

[GraH - Guido]

You are always adding 1 day?


[F9]=IF(ISBLANK(E9),"-",WORKDAY(E9,G9,HOLIDAYS)) seems to work just fine.