I also really like the Bitcoin block number. It will likely be one of the most provable records of time passing, but not as convienent for tracking or converting time.
Unix is the easiest format I’ve used. It’s easy to parse, it’s consistent, there’s not usually competing unix like formats, it converts perfectly to other time formats, most file explorers can immediately sort it correctly, and it’s clearly the date from which the universe spawned into existence.
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