My friend Guillaume Tello, have done a nice small program to use RTC module under Atari for the V4SA.
You can find it here :
If you are using Emutos only put V4_RTC.PRG in your auto folder
If you are using Mint run it from mint.cnf (Mint not read already setup time and date)
Then set up the time and date once with V4SETRTC.PRG
Work nice, next time you will start your V4SA time will be ok! This need of course the RTC module.