InfoPath Dev

I am trying to set up validation to make sure the date entered is within 24 hours of todays date. I want to do something like the following but it doesn't seem to work...

dateField is greater then today()+1 or
dateField is less then today()-1

this does not work. Does any one know how to add to a date.

You can do date math in InfoPath 2007. For InfoPath 2003 you need to write your own code to do date math.