This pipe merely creates an item indicating when the pipe was accessed. The item ID is the utime of the access, so every time this pipe is accessed by a feedreader, a new item is in the feed. I used this to test the update frequency of blogger's RSS widget. (3 hours)
This pipe takes a date, offsets it by a given number of hours, and formats it with the date format module. The date format module doesn't let you choose the timezone of the formated date, this pipe is the workarround.