What time is it on the Moon?

Fundamentally, and ignoring the complications
of Einstein’s Special Relativity, it’s the same time
as it is here on Earth. But this is a bit of a cheat,
of course, because we haven’t defined how we
are measuring time.
There are many ways to define the ‘time’
at a particular location. Here, on Earth our usual
system (‘solar time’) is defined by the motion
of the Sun in the sky (although we usually keep
track of time with an atomic clock). This means
that the local time depends on where you are on
Earth and we get around this complication by
having many different time zones. Now, we could
also define a similar time system based
on the motion of the Sun as seen from the Moon.
Such a system exists (Lunar Standard Time) but
it is not much more than an interesting exercise
in physics. What is more useful, however, is
a definition of time that doesn’t vary with
location. This is called Universal Time (UT)
and is a modern form of Greenwich Mean Time.
It is the same everywhere in the Universe.
So, the UT time on the Moon is the same as
the UT time on Earth.

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