change timeline from bars to mins/secs

hi,i seem to recall being able to tell how many mins and seconds had elapsed in my projects.
i must have accidently pressed a key by mistake,because now i get reading of bars etc in the clock window.
can anyone help?

Assumption: clock window = time display on the transport panel

(I think) right click on the time display.

(Operation Manual, Pages 84-85)

good man,i got it sorted now.thanks.