Is Dates.UTInstant UT1, UT2, or UTC?

[ssfrr]

There’s a footnote in the Dates docs that says they’re UT1.

There have been a few long threads comparing various time representations. Here’s one:

Higher resolution DateTime/TimeStamp

Nothing ambiguous about it: Base’s time is in UT1, modulo time zones (which are a whole other can of worms). This is in contrast to many other language’s time systems which claim to be in UTC and then ignore leap seconds – which is contradictory, not just ambiguous.

I think there have been more…