How Sarra Handles Time Zones

Sarra anchors every calculation to the time zone saved on your profile, which defaults to UTC until you set it. Time zones stated in an email, such as PST or EST, are converted into yours before your calendar is checked. Booking-page visitors get their zone detected from the browser, with a manual override.

Which time zone Sarra uses, where it comes from, and what she will not infer.