Abstract: Disclosed is a golf clock and a control system using such clock to control the timing of play of golfers on a golf course. The golf clock has a first digital display programmed to indicate a total elapsed time from the beginning of play to the end of play and a second digital display coupled to a digital memory means capable of receiving, storing and displaying a series of predetermined playing time periods for each hole of the golf course. The golf clock is self contained and is detachably mounted on a golf cart.