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I think it would be quite useful to add timeago that would show the time that has passed since the post/comment was published (e.g. "4 minutes ago" or "about 1 day ago") rather than just the time.
This addon seems to do just that https://open.vanillaforums.com/addon/timeago-plugin.
I don't know much about vanilla so i don't know if it works with this forum.
Adding timeago.js manually might also be possible or be the better option.