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A new PNG spec

(www.programmax.net)
615 points bluedel | 2 comments | 24 Jun 25 13:01 UTC | HN request time: 0.403s | source
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ggm ◴[25 Jun 25 05:26 UTC] No.44373884[source]▶
Somebody needs to manage human time/date approximates in a way other people in s/w will align to.

"photo scanned in 2025, is about something in easter, before 1940 and after 1920"

replies(2): >>44374228 #>>44374233 #
1. luguenth ◴[25 Jun 25 06:39 UTC] No.44374233[source]▶
In EXIF, you have DateTimeDigitized [0]

For ambiguous dates there is the EDTF Spec[1] which would be nice to see more widely adopted.

[0] https://www.media.mit.edu/pia/Research/deepview/exif.html

[1] https://www.loc.gov/standards/datetime/

replies(1): >>44374303 #
2. ggm ◴[25 Jun 25 06:51 UTC] No.44374303[source]▶
I remember reading about this in a web forum mainly for dublin core fanatics. Metadata is fascinating.

Different software reacts in different ways to partial specifications of yyyy/mm/dd such that you can try some of the cute tricks but probably only one s.w. package honours it.

And the majors ignore almost all fields other than a core set of one or two, disagree about their semantics, and also do wierd stuff with file name and atime/mtime.