We never said we're good at math, so it was to be expected that our code for RTC time validation will be broken in some way (/s). Being more serious the RTC set fails exactly on August 17th 2021:
MfgCompatTime raw data: sec=38 min=1 hr=3 wkd=2 day=17 mth=7 yr=121
Invalid RTC regular year day of month in rtc_proxy_set_time
We never said we're good at math, so it was to be expected that our code for RTC time validation will be broken in some way (/s). Being more serious the RTC set fails exactly on August 17th 2021: