I hate it when someone posts that this or that will take place on 3pm their-weird-timezone-name.

Dad, geek, conversation liquidity provider. vrypan.net (home), /weatherxm (work), @l--o--l (fun). Also https://paragraph.xyz/@purplesubmarine

The only social app that treats dates correctly (i.e. translates them to local  time) is Discord. Can we get something like this for Farcaster? 

If this was at the protocol level, we could treat datetimes as embeds, store them in uinixtimestamp (GMT), and let clients present them as they like.

What do you think?

Or maybe introduce some kind of markup that is standardised and all farcaster clients can render?

It seems that when the app gives them the option and makes it easy, many of them do. Discord  servers are full of such examples. I don't see why someone announcing their live stream won't add the date correctly if it was just a matter of clicking button or typing "/".

Users won't want to take the time to do it correctly. I suspect clients could auto-convert, but seems lower priority.

Agreed! 
Local date reflection is extremely under represented.
I used DateTimeCord religiously when I was managing my previous Discord community to accommodate this. Some polling bots such as Mee6 & Apollo also seamlessly addressed this

Agreed! 
Local date reflection is extremely under represented.
I used DateTimeCord religiously when I was managing my previous Discord community to accommodate this. Some polling bots such as Mee6 & Apollo also seamlessly addressed this
https://datetimecord.rauf.wtf/