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Clarify that Unix timestamps disregard leap seconds since 1970

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Fixes #1626.
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heinrich5991 2023-08-22 17:36:36 +02:00
parent 4f8b8a746c
commit 47da6ad4cc
2 changed files with 9 additions and 3 deletions
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changelogs/appendices/newsfragments/1627.clarification Normal file
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Clarify timestamp specification with respect to leap seconds

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content/_index.md
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@ -419,9 +419,14 @@ 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 [Unix
timestamps](https://en.wikipedia.org/wiki/Unix_time), but measured in
milliseconds. This means, they approximate the number of milliseconds
since 1970-01-01 00:00:00.000 UTC, but disregard leap seconds so that
each day is precisely 86,400,000 milliseconds. This also means that
timestamps can repeat. Most programming languages provide timestamps in
that format natively. Throughout the specification this may be referred
to as POSIX, Unix, or just "time in milliseconds".
## Specification Versions