Digital clock, right? Reusing it safely, without releasing its Magic Smoke, will require a little electronics background and some sleuthing.

Because this was part of an appliance, you can't just buy a power cord for it and plug it in. You have to figure out for yourself where power is applied to the clock, and what that power is (240 volts, 120 volts, or maybe some other voltage provided by a transformer elsewhere in the range).

If it was a gas range, it's almost surely 120 volts. If it was electric, it could be any of the above.

My guess would be that the red and white wires supply 120 volts to the transformer (the large square black and white item). If I'm right, you'd connect those to your line cord - probably red to black and white to white. Connect the line cord's green wire to the metal box you make to enclose the clock to prevent shock.. (You ARE planning to do that, right?) But that's only a guess.

If you want to use the clock to CONTROL something, not just check the time, that's going to be more of a challenge than just getting it to light up and count off the hours.

If you don't have some electronics knowledge, the safe thing to do here is to recycle the old clock, and buy a premade one that does what you need.