Abstract: A timer for attachment to a stove operated by manually controlled gas control knobs converts an ordinary manually operated stove to a timer controlled stove without requiring a technician to cut in to the gas lines of the stove. The timer includes a housing with a knob rotating shaft mounted in the housing. A knob gripper is mounted on the end of the knob rotating shaft for gripping the manually operated fuel control knob of the stove. A mechanism is mounted in the housing for rotating the knob rotating shaft. A timer is connected to the mechanism in such a way that if the knob gripper is gripping the fuel control knob, the mechanism rotates the fuel control knob through a predetermined angle, after a time delay determined by the setting of the timer. In this way if the fuel control knob of the stove is connected to a fuel valve shaft, rotation of the fuel control knob rotates the fuel valve shaft to limit the flow of fuel to the burner on the stove.