In nostr you can publish past and future notes but I don't know if we have clients for that.
Discussion
This would be cool for importing blogs, but it would cause havoc for ordinary notes.
I wonder if I post a note in the future will it stay at the top of the feed until it arrives on its date?
Some relays may implement NIP-22, which would reject notes outside a defined upper and lower limit. I don’t know which ones actually do, though.