If you're just looking for help with writing the sketch, then you would probably be better off in the Programming Questions section. In there, you will want to review the thread at the top that guides you through what your post should include (like code, what you're expecting vs what it is doing, what have you tried, etc.).
Otherwise, if you're looking to have someone write the code for you, you are in the right place. Do you have the hardware already? If so, what "LED display" are you using? Do you have an RTC module for the time? If so, which?