I have a button in an app that allows a user to enter a fixed period, i.e. they specify the start and end date and it always stays the same. I have another button that allows them to enter an offset/delay and a length/duration of time that "stays current" but I can't think of a single word that would fit on my button that would describe this.
For example, let's say I select this "stays recent" button and specify a delay of 3 months and a duration of 12 months, that means if I were to look at the data in June 2014, it would show data from March 2013 to March 2014 (12 months, from 3 months back). Then if I were to go and look at the data in October 2014, it would show data from July 2013 to July 2014.
Best Answer
I see quite a few options similar to this while doing analytics on software usage. There are a couple common phrases related to the concept but most of them bank on words from two categories.
The first is the "relative" descriptor:
The second is the "timeframe" descriptor:
Common phrases, then:
The other pattern I see frequently is to use "last" or "past" and the specific range set. This is best when the "right side" of the range is anchored to "now":
If the right side is also configurable, you can use "ago" or its synonyms:
To specifically answer your question, I would use something like "moving snapshot" with "starting date" and "delay" and "duration" as your three fields. When displaying the full graph, I would label it with the specific dates in the snapshot.