[3] Datetimes. The draft ISO 8601-201x and EDTF. · Issue #656 · plk/biblatex · GitHub, 2022-06-28T02:48:38.000Z https://github.com/plk/biblatex/issues/656

[1] Should we create an Open Datetime Format? · Issue #1 · JohnLukeBentley/open-datetime-standard-bootstrap (2019-05-08 18:02:35 +09:00) https://github.com/JohnLukeBentley/open-datetime-standard-bootstrap/issues/1

[4] Bibliographic Datetime Format (BDF) - BibliographicDatetimeFormat.pdf, 2022-06-28T03:10:27.000Z https://raw.githubusercontent.com/JohnLukeBentley/open-datetime-standard-bootstrap/v0.1.2-draft/BibliographicDatetimeFormat.pdf

[2] open-datetime-standard-bootstrap/BibliographicDatetimeFormat.pdf at master · JohnLukeBentley/open-datetime-standard-bootstrap (2019-05-08 18:44:27 +09:00) https://github.com/JohnLukeBentley/open-datetime-standard-bootstrap/blob/master/BibliographicDatetimeFormat.pdf