While this is really a Final Cut Pro question more suited to the Final Cut Pro forum, I'm going to assume that it being posted in the DVX100 forum means that you have a DVX100?
If you have a 100 or a 100a, you can use the interval recording feature to record time lapse in-camera. It may still necessitate some tweaking in post, in which case you'd open the clip in the viewer and adjust the playback speed. And using time remapping, you can pretty much take any long clip and speed it up to emulate a time lapse.