Re: Org mode timestamps on the Moon ;] (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda)

[Ihor Radchenko]

Tom Gillespie <tgbugs@gmail.com> writes:

> Oh boy. In short, I think we can only hope they come up with
> LTC and we already have a syntactic space to say whether
> our reference seconds are TAI/UTC/LTC/MTC/JTC etc. And
> being the privileged squats that we are if the time system is
> left out then it means UTC. The friendly thing to do would be
> to always include the time system code in our timestamps,
> but I don't think those have standard reference codes yet?

I cannot see anything in
https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

So, just UTC. If we want to support more, it will have to be done
manually. 

> I don't think we want to force users to start embedding their gps
> coordinates, their current acceleration, etc. along with their
> timestamp. But it turns out that the unix epoch is only standard
> at 9.8m/s^2. So ... minutes should be ok right?

> Joking aside. Clocks run faster on the moon, slower on the ISS,
> so either clocks are synchronized back to earth seconds, or
> they use some alternate standard reference time.

I am afraid that calculating "real" time inside a given reference system
is impossible now. Time from epoch in Greenwich when you are looking
from inside Greenwich and time from epoch in Greenwich when you are
looking from inside ISS are two different time intervals. And what about
time from epoch in ISS when looking from Greenwich?

And then we also synchronize time with UTC now. But time since epoch in
UTC when looking from UTC and time from epoch in UTC when looking from
different elevation are different times :)

Further, what does it mean to have a meeting scheduled for
<2023-01-30 Mon 14:00 @Europe/Berlin>--<2023-01-30 Mon 20:00 @Asia/Singapore>
What is the reference frame? Europe/Berlin gravitation well?
Asia/Singapore well? Local well?

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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