The display name is localized based on the culture installed with the Windows operating system.
Time zone display names for Windows system time zones follow a fairly standard format. The first portion of the display name is the time zone's base offset from Coordinated Universal Time, which is indicated by the acronym GMT (for Greenwich Mean Time), enclosed in parentheses. For Coordinated Universal Time, the GMT acronym with no offset is enclosed in parentheses. This is followed by a string that identifies the time zone or one or more of the cities, regions, or countries in the time zone. For example:
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)