I was looking for this. So it is good to find it.
When looking at the code in ev_rtc.c, I noticed that Telink is using year 2000 as start of UTC time.
If I want to sync the time that I get from NTP server, the start year that is used by NTP server is 1900. So I will get incorrect result.
I know that I can change in the code the start year to 1900.
The other way would be to enter the time in the time structure and convert it using ev_rtc_utc2Second().
But is there a reason why Telink decided to use 2000?
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