When you request a candidate's availability, they'll choose the times based on their computer's current time zone. 


When you view the availability request, the times will be calculated based on the timezone you selected for your user account. 


If you ever want to check the candidate's time zone, it will be recorded at the top of their candidate profile.


When you schedule the interview, both your invite and your candidate's invite will have the correct times based on your respective time zones.

Note: Your time zone can be updated in your Greenhouse Recruiting user account.