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Clarify that Unix timestamps disregard leap seconds since 1970 (#1627)

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Fixes #1626.
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heinrich5991 2023-08-24 08:11:47 +02:00 • committed by GitHub
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@ -419,9 +419,16 @@ into the `m.` namespace.
### Timestamps
Unless otherwise stated, timestamps are measured as milliseconds since
the Unix epoch. Throughout the specification this may be referred to as
POSIX, Unix, or just "time in milliseconds".
Unless otherwise stated, timestamps are the number of milliseconds
elapsed since the unix epoch (1970-01-01 00:00:00 UTC), but not counting
leap seconds, so that each day is precisely 86,400,000 milliseconds.
This means that timestamps can repeat during leap seconds. Most
programming languages provide timestamps in that format natively, e.g.
[ECMAScript](https://tc39.es/ecma262/multipage/numbers-and-dates.html#sec-time-values-and-time-range).
Throughout the specification this may be referred to as POSIX,
[Unix](https://en.wikipedia.org/wiki/Unix_time), or just "time in
milliseconds".
## Specification Versions