One way to find time zones is by using the Time Zone Map:
Once you are on the map page, you will see 3 different time zones listed:
Auto-Detected Time Zone
The time zone that the map has auto-detected from your location.
Selected Time Zone
The time zone that you currently have selected.
Click any location on the map to see the time zone name!
Hovered Time Zone
If you are on PC, this will be the name of the time zone you are hovering over with your mouse.
You can click the "Copy" button to copy the selected time zone, and paste this where Friend Time needs a time zone:
Friend Time uses a special format for time zone names (more specifically the IANA Time Zone Database, an international standard for time zones).
Time zone names are in a "Region/City" format, for example: