First you will need to change the voltage by a step down transformer.
This method can be used for the American digital clocks where main supply frequency is used as the clock pulse. Normally these digital clocks use LM8560 or SC8560 ,and these ICs have an option to select 50Hz or 60Hz. But America's main AC is 60Hz therefore this pin is not connected to any . Just look at the datasheets of these ICs and connect the relevant pin to the correct point.
This method can be used for the American digital clocks where main supply frequency is used as the clock pulse. Normally these digital clocks use LM8560 or SC8560 ,and these ICs have an option to select 50Hz or 60Hz. But America's main AC is 60Hz therefore this pin is not connected to any . Just look at the datasheets of these ICs and connect the relevant pin to the correct point.