Is it normal behavior for posts just made today to had a timestamp of "yesterday?"

I never noticed this behavior before, but it's happening right now on my end. Weird.

 

It may have to do with your timezone settings, other than that a lot of our ecosystem is on CPH time default as that's where most of it began. I would check those settings first, tap your name in the top right and peek into your preferences.

You'll notice if we publish to our blog later in the day PST that it shows it's coming from the future.