Hacker News new | ask | show | jobs
by SAI_Peregrinus 486 days ago
ISO 8601 allowing week-based year numbering is even more insane. E.g. In 2007-12-31 (in RFC 3339 format) is allowed to be notated as 2008-W01-1 in ISO 8601. RFC 3339 is superior, partly because it prevents this bullshit.

ISO week numbering is actually sort of neat, because instead of leap days it has entire leap weeks since the 400-year Gregorian cycle has a whole number of weeks in it, but for some reason they decided that a week's year is the Gregorian year in which the Thursday of that week occurs.