Reset Pi time automatically without rebooting

[Mustang65]

I have a Pi3 in my RV running 24/7 with battery backup, so it should never need to reboot. The RV is in the mountains about 600 miles away from me, 6 months out of the year. The Pi tends to loose time each day and after a while it is giving me wrong times in my sensor dB. I do not have a RTC on it, which probably would have been the best way to go, but it is connected to the internet at the campground.

I would like to update the Pi's clock at least once a day automatically, without re-booting the Pi or dropping the internet connection. I looked around and was unable to locate anything that I could use with a batch process and chron. Does anyone have a solution for this project of mine, or point me in the direction that may have the script to accomplish this?
Thanks
Don

[DougieLawson]

Either replace timedatectl with NTP or restart timedatectl daily or fit a RTC hardware board.

At a distance adding a crontab to run sudo restart timesyncd is probably easiest for now.

[Mustang65]

Thank you, I will give this a try and see what happens.
Don