Calendly automatically detects your invitee's time zone and displays times you're available in their time zone to make scheduling easier. If an invitee wants to view your availability in a different time zone, they can choose a different time zone on your scheduling page.
Expand When can people book this event?.
Scroll down and expand Additional rules for your availability.
Scroll down to Time zone display.
To show invitees your availability in their own time zone, select Automatically detect...
To show your availability in your time zone, select Lock the timezone.
Select Save & Close.