If you don't have one ds1307 is not the best available module for the Pi.
I recommend ds3231 which is a better performer and works from 3.3V
The ONLY thing you have to do is include in /boot/config.txt:
While you can access the RTC time, there is little point - just use any means of accessing system time which is synchronised to RTC.
timedatectl will show status of RTC as well as system.
Local time: Sun 2019-02-24 17:19:42 AEDT
Universal time: Sun 2019-02-24 06:19:42 UTC
RTC time: Sun 2019-02-24 06:19:42
Time zone: Australia/Sydney (AEDT, +1100)
Network time on: yes
NTP synchronized: yes
RTC in local TZ: no
sudo hwclock -r will show