Tor should log what it thinks the time is sometime(s)
Many issues come from incorrect time/date/timezone settings. And not all the time does Tor log about how it believes the user's clock is wrong by X hours and Y minutes.
For many linux/macos users we can ask them to tell us the output of
date -u as a huge troubleshooting help. But not everyone is capable of that. A maybe shouldn't be expected to be.
Log what Tor thinks the UTC time, local time, and configured timezone are at startup once
Log periodically (say, every HeartbeatPeriod) what Tor thinks [... all the above ...]
Can we put the timezone in the log line's timestamp? Would that be enough? Is that dangerous for users? Do we make promises about parse-ability that we'd be breaking?