what's the use case here? so it will return nothing between 1h-23H?
OK, let's try this: https://23gmt.nostr.technology/
A relay that only accepts kind:1 root notes only between 23GMT and 24GMT (also known as: right now) every day and deletes everything one hour after closing every day.
Also only "protected" notes are accepted so they don't leak.
Discussion
I'm just copying https://www.seven39.com/