Hi- I would like to know this as well. I'm using Infopath 2003. My situation- I have a date picker, which by rules I set, will only allow the user to select a Monday. Now, when they select that Monday, I would like that date to auto populate into a "Monday" text box (or expression box), and then auto populate the "Tuesday" text box (or expression box )next to it, with it's correct date, based off of what was selected for Monday. Basically a [Date], [Date] +1, [Date] +2, etc. I know it can be done easily in IP2007 (but I'm using IP2003) but I'm not sure of the coding or how to enter the coding in IP2003. Please help. Thanks.