The "Timebar" indicates :
- time as a frame ruler and you click and drag within it to scrub your timeline.
- display the keyframes you have set, their activation state and the selected one (not in the Graphs Panel's Timebar).
To change the scale of the Timeline put your mousepointer over the grey frame ruler and use your mouse wheel to zoom in or out.
Keyframes in the Timebar
During a keyframe drag and drop operation a tooltip indicator will be displayed with some time informations.
Right click over a keyframe or in upper part of the "Timebar" open the keyframe contextual menu giving access to the keyframes actions.