I have seen many of this similar questions about the RTC. I'm currently trying to setup my Arduino to trigger my relay to close on monday and wednesday at 5pm -5:10pm.
I know I have to use now.dayOfTheWeek() will return you the weekday number and now.hour() will return you the hour set a pin
Anyone ever setup date and time with the RTC on the ardunio?
Adafruit PCF8523 Real Time Clock
8 Channel DC 5V Relay Module
How you get the time and how you drive the relay will depend on your hardware and on the library (if any) that you'll be using for the RTC. If your relay is bistable, the logic is a bit different: you'll have to turn it on at 1700 and turn it off at 1710.
Have you written any code yet? How is it working right now?