January 2, 0101

ownedbycats · 02-10-2022, 06:02 PM

The earliest available date for datetime fields is January 2, 0101. (January 1 just turns into undefined.)

Where does that come from? It doesn't match any of the epoches I'm aware of; I think Python itself runs on Unix time-- and a good thing Calibre doesn't, seeing as books existed before 1970.

kovidgoyal · 02-10-2022, 08:20 PM

It comes from limitations in various date/time handling libraries that I didnt feel like re-implementing. Timestamps in calibre are not stored using epochs but instead as ISO 8601 strings.

02-10-2022, 06:02 PM	#1
ownedbycats Custom User Title Posts: 10,797 Karma: 74203799 Join Date: Oct 2018 Location: Canada Device: Kobo Libra H2O, formerly Aura HD	January 2, 0101 The earliest available date for datetime fields is January 2, 0101. (January 1 just turns into undefined.) Where does that come from? It doesn't match any of the epoches I'm aware of; I think Python itself runs on Unix time-- and a good thing Calibre doesn't, seeing as books existed before 1970.

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02-10-2022, 08:20 PM	#2
kovidgoyal creator of calibre Posts: 45,251 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It comes from limitations in various date/time handling libraries that I didnt feel like re-implementing. Timestamps in calibre are not stored using epochs but instead as ISO 8601 strings.

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