I can confirm this happens to all posts and the difference is always the same. Its switching from some system timezone to local time zone. Even the inspect element shows the same:
Hmm, okay. I suppose I'm used to the time zone conversions being instant and out of sight of the users everywhere else. I probably wouldn't have noticed without current events
I think it switches from EST to your local timezone, not sure.
Well, my time zone is EST and those time zones don't seem to make any sense from when the posts were made.
Noticing this was specifically in response to possibly editing posts at the admin level to reflect a 0 delta.
I can confirm this happens to all posts and the difference is always the same. Its switching from some system timezone to local time zone. Even the inspect element shows the same:
https://i.imgur.com/dx8nOKU.png
Hmm, okay. I suppose I'm used to the time zone conversions being instant and out of sight of the users everywhere else. I probably wouldn't have noticed without current events