Get date and time between

Hey all, I’m trying to find tutorials or some code on ways to get user-inputted dates and how to calculate the time between (in days, weeks, months). Particularly I am looking on what display objects would be good for getting date from user, as well as how to calculate the difference from that date to another (or today). Anyone know where I can find some info? [import]uid: 132483 topic_id: 34529 reply_id: 334529[/import]