Thank you for using Yahoo Pipes! To help focus our efforts on core Yahoo product experiences, users will no longer be able to create new Pipes starting August 30th 2015. The service will be put in read-only mode until we will discontinue Yahoo Pipes on September 30th 2015. You can find more details here.
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.