Allow setting time / date with a service

[canton7]

On a 5 month period, I would say the internal clock is about 8 min behind.
I disconnected my inverter from the internet the end of May. I reconnected it today in the hope DST would be applied, but alas ... I had to set it manually and that's when I saw the time was 52 minutes ahead when it should be 1:00 :)

So @canton7, any news on that time/date integration? 😇
I would love to be able to read the internal time of the inverter and set it via HA.

Originally posted by @screenagerbe in #293 (reply in thread)