Calendar - what are session_open and session_close?

For start of 2020-01-01 the response form (with formatting added for readability) is:


The properties date, open and close are documented.

What do session_open and session_close represent?

Perhaps the intent is to represent extended hours at some point? The current values don’t align with the current extended hours with Alpaca though.


I have the same question. Did you ever hear back or figure it out?

Nope. Haven’t heard anything.

Did anyone ever find out what it is?

Bumping this since I need the answer.