The TimeZone and TimeZone2TimeZone functions are not available on mainframe platforms like z/OS. They are only available on Windows and UNIX platforms.
These functions use the International Components for Unicode (ICU) library. The ICU system time zones are derived from the tz database (also known as the Olson database) available at...
This is the data used across much of the industry, including by UNIX systems.
The ICU time zone functionality supports
continent/city or ocean/city
For example, America/Los_Angeles is an ID for Pacific Standard Time.
"GMT[+|-]hh[[:]mm]")
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