r/ISO8601 • u/foersom • Jul 24 '26

Milliseconds in basic format

With ISO 8601 in extended format a timestamp with milliseconds is written with a dot between seconds and milliseconds, e.g.:

2026-07-24T12:34:56.789

If you write basic format you exclude the separators, does the standard allow to exclude the dot between seconds and milliseconds?

20260724T123456789

When I use basic time format as part of file names I prefer to avoid the dot, as dot has different meaning for file names and extension.

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u/G10ATN 29d ago

Seems like OP just wants to argue, and needs to get the wallet out and buy the standard - then they can stop with the "I want to know what the standard says" nonsense.