UPM Programmable Timers  

UPM-DT523 Outdoor Programmable Timer with Photocell
Price $20.63
The UPM-DT523 is designed to reduce the amount of time lights are used after dark. For example, even if your lights are programmed to switch on at 6pm but if the sun does not set until 7pm, the timer will not go on until 7pm. If you prefer the lights are activated at 6pm regardless of lighting, you can program your timer so that they do come on.