Invalidate a date field based when date field doesn't equal other date field and checkbox checked

Hi,

for me it works this way:

I think you could alway wrap your equals in a "not" to achieve the same.

EDIT: Just checked, the formula halfDay && not(equals(sd,ed)) also works for me

Thanks for the suggestion.  I just tried that out and I'm still getting the validation when the start date equals end date and half day is checked.

It seems to work right and removed the validation when Half Day isn't checked, but when it is checked and days are equal it still gives the validation.

I'm using named controls in my rules and both date fields are set to date only.

Alright, I've finally figured it out.  Seems like a weird solution to have to do it this way, but it works.