Weekly availability hours were read in New York time, whatever your account time zone was. They now use your account time zone, which the Availability page names and can change.
Your meeting page shows dates and times in the visitor's time zone, taken from their browser, with a Time zone list to change it. The selected time and the confirmation page show the time in the visitor's zone and in yours.
Confirmation, reschedule and cancellation emails, SMS reminders and Slack messages show each recipient's own time zone, with the other person's time beside it when it differs. Meeting pages and the edit form use your account time zone.
Accounts created with Google, Apple or LinkedIn sign-in start in New York time. When your browser's time zone differs from the account's, Availability, All Meetings and the Meetings dashboard offer to switch.
A meeting's page now has Cancel meeting, and Edit meeting is renamed Change time or attendee.