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Re:Show HN: Every Day Is Pi Day by fao_ on Tuesday March 14, 2017 @10:47AM (#13867877)
Actually ISO 8601 states that the datecode format that should be used is

YYYY-MM-DDTHH:MM:SS+<OFFSET>

in this format, Pi day is:

2017-03-14 (The rest of the complete format omitted since it is not strictly relevant)

Re:Show HN: Every Day Is Pi Day by Jaruzel on Tuesday March 14, 2017 @10:51AM (#13867904)
Except that's not what people mean when the say 'Pi Day' - they mean the US date format of 3-14.
Re:Show HN: Every Day Is Pi Day by fao_ on Tuesday March 14, 2017 @11:41AM (#13868400)
If both work, and the one interpretation overlaps and is an international standard, who cares?
Re:Show HN: Every Day Is Pi Day by athenot on Tuesday March 14, 2017 @12:31PM (#13868951)
Maybe that day can be written 2017-π to preserve both the pun and (if not the letter) the spirit of ISO notation. In that sense, it's Pi day for a given year.