This is the kind of code that shouldn't have to be written if the protocol (Bluesky, in this case) adhered to the principles described in http://this.how/standards ("Fewer formats is better", one is better than two):

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Unix epoch maxi

At least they support posts with creation dates before computers even existed.

If they try supporting 8601 they should really go all the way at that point...

No reason to use anything other than epoch.