What timezone is "DefaultTimeZoneInfoKey" in when the API returns data?

Q: The timezone displays as "40". What timezone is "DefaultTimeZoneInfoKey" in for the API calls? It looks like this: 

<DefaultTimeZoneInfoKey>40</DefaultTimeZoneInfoKey>

<ShowOpen>2017-04-26 08:15:00.000</ShowOpen>

<ShowClose>2017-04-26 10:30:00.000</ShowClose>

A: 

• API returns data in our CT zone
• User API doc has a table as appendix starts on page 59, which is attached.

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