Home.io: Wrong Time and Date

hi everyone

I have a problem with the time and date of my HomeAssistant. After looking at the logbook and history after a long vacation, I discovered that there were no more entries to be seen. Furthermore, I have no longer received weather data. When I wanted to upgrade the home assistant to the latest version, I noticed that the date was wrong for almost a month. It shows today on 20.01.2020 11:22 am the date from 26.12.2019 at 00:48.

I don’t know how that happened and so far I haven’t been able to find the problem, let alone solve it.

I would be very happy about any help.

greetings
Tyrannis