Le 2019-08-31 10:44, Zbigniew Jędrzejewski-Szmek a écrit :

(I asked a few people what 24:00 means to them, and after getting a
few strange looks and answers,

To be fair:

1. ISO 8501 allows writing 24:00

Wikipedia> Midnight is a special case and may be referred to as either "00:00" or "24:00". The notation "00:00" Wikipedia> is used at the beginning of a calendar day and is the more frequently used. At the end of a day use Wikipedia> "24:00". "2007-04-05T24:00" is the same instant as "2007-04-06T00:00"

2. However the IETF explicitely forbid it when defining the ISO 8501 subset allowed on the Internet

RFC 3339> Although ISO 8601 permits the hour to be "24", this profile of ISO RFC 3339> 8601 only allows values between "00" and "23" for the hour in order
RFC 3339> to reduce confusion.

Therefore, banning the 24:00 notation is necessary for interoperability, even if one does not agree with the IETF decision. (00:00 however is well-defined and not ambiguous)

Regards,

--
Nicolas Mailhot
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