The Timeline is where all of the motion in an Edge composition is orchestrated. The Timeline itself shares concepts and constructs from other Adobe applications, most notably Flash Professional and After Effects.
Unlike the frame-based timeline in Flash Professional, the Edge Timeline is purely time-based.
The playback controls in Edge are all grouped together to in the upper left corner of the Timeline panel. These controls allow quick access to many of the playback options available through the Timeline.
The time in Edge is measured in standard decimal timecode format:
mm:ss.ddd, and this is how it is ...