http://en.wikipedia.org/wiki/Time_switch

http://uk.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=timer%20switches&cm_mmc=PPC-_-Google-_-explorer50033-_-Broad&gclid=CJ_bt4Kk9J0CFU0A4wod83ICJA

Intermatic WH21 25A Water Heater Timer Electric External Switch

13 reviews - $28 new - 26 storesIntermatic EH40 Mechanical/Digital Water Heater Timer
$67 new - 14 storesBosch 1600H NG Natural Gas Tankless Water Heater

$630 new - 22 stores

Cheap and effective.

They have programmable timers like for watering your lawn.

You can do a fast one by install those power timer that can be set it to ON and when it should OFF.

Another way if you know some electronic circuit then you will need to design it with a RTC that will turn on the display at the require time. It even can display the time or text on the display board.

By the way what type of display board are you using. LCD or LED?

my shop display board is running by two tube lights as i am closing on early hours i am unable to switch off that lights before 10:00pm so i want a circuit which must turn on at 5pm and turn off at 10pm. please suggest me a circuit by using RTC.

thank u

vijay

If that the case use those 24 hours time.

Like I found in Farnell

REX - MICROREX T31 - TIME SWITCH, 24HOUR

It can be set at what time you like to ON and OFF.