Seen from this light, I agree that some version of the ISO date format (one with a numeric timezone offset) would be better than 822/2822 date-time if we were starting from scratch. I'm not sure whether it's still worth switching to a new date format when considering conversion issues - versus carefully documenting how to generate and parse 2822 date-times.
It's trivial to convert an ISO (or epoch) date format to the 822 format It's not too hard to convert a valid 822 format date to an ISO format date
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