This property returns a string which specifies the abbreviated time
zone code in which the external IP address is located. If daylight
savings time is used within the time zone, then this value can change
based on whether or not daylight savings is in effect. For example, if
the IP address is located within the Pacific time zone in the United
States, this will return "PDT" when daylight savings is in
effect and "PST" when it is not.
If the time zone code cannot be determined for this location, a value such
as "UTC+9" may be returned, indicating the number of hours
ahead or behind UTC.