Thanks Hilary. Forgive me but I'm still stooped on this (I'm very novice when it comes to any programming whatsoever). Yes I want them to enter 2359 and have the colon added with the condition that if they enter anything greater than that (ie 2360 would be an error), it just stays on that value they entered with the validation error rather then defaulting to todays date or the 1899 date format. I noticed that for example if I manually add in the colon with an invalid time (I.E. 55:55) then 55:55 is what is displayed when I tab away with the validation red box error, which is what I want it to show (just what is typed in). The colon doesn't have to be there (ie automatically added), so if they typed in 5555 then a validation is shown with just "5555" in the box. I'm unsure where I would set that condition exactly. Do I add it on to the existing conditions (set condition) for both rules? I tried doing stuff there that wasn't working, like saying only apply rule (along with the other conditions) if the time is less than 23:59 (they make me type in a colon since the only options for a greater than condition are typing in a date and time which they want a year, month, and day with the time, select a field or group or use a formula) but that did nothing.
Another way to put all this is can I display something else as an error in the box, if an invalid date is put in there?
I really appreciate all the help so far!