The account time zone is used to determine:
When the weekly schedule emails are sent to your team.
When your imported Google Calendar/Outlook events are displayed.
It can be set by the Account Owner or an Admin from the Preferences tab within the Team settings.
Tasks created directly in Float are set to the specific time they are scheduled, regardless of where your team is located (e.g., a task set for 2 p.m. displays at 2 p.m. for everyone it is assigned to).