What is my time zone set to?

Your time zone will be consistent with the time zone of the location where you created your account. 

However, your time zone will change automatically whenever your device's timezone is updated (for example, when you travel). You may need to close and re-open your app, and confirm that your device's time zone has changed as well. 

Duolingo Clubs leaderboards reset on Mondays 00:00 UTC.