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This is another variant you'll see in metadata.
20071214T175538-0800
Sometimes shortened to this:
20071214
Both, I believe, are ISO compliant. (At least that's what the comment in the XML DTD file said. I never looked it up)
In both cases each date/time indicator uses exactly 2 characters.
(century, month, day, time separator (T), hours, minutes, seconds, timezone separator (+/-) gmt offset hours, gmt offset minutes)
I use a pure applescript handler that took about 5 minutes to write to generate these. I didn't know about the isot class, that's kind of cool. I may use that instead. ES
Also, I've seen a date/time format in XMP metadata like this:
2007-12-14T17:55:38-08:00
=
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