Follow these steps:-
1. First leaen how to interface seven segment display with a microcontroller.
2. Learn how to do multiplexing with seven segment display
3. Learn How to use RTC module with microcontroller.
Finally make the whole clock.
You will find all the helps you need to learn those 3 steps here in EDABOARD. Just search
Follow these steps:-
1. First leaen how to interface seven segment display with a microcontroller.
2. Learn how to do multiplexing with seven segment display
....