> GMT and UTC are the same timezone. I got one for OP, too: UTC is not a timezone in the first place [1]. > UTC is not a time zone, but a time standard that is the basis for civil time and time zones worldwide. This means that no country or territory officially uses UTC as a local time. The difference is subtle, but a standard is not subject to government whims while a timezone is. 1. https://www.timeanddate.com/time…
Still subject to IERS whims, though.
Sure but governments can and do change timezones more regularly than programmers keep up [1]. In 2014, Egypt's new government changed their timezone with only a week notice.
Updating standards almost never happens, unless with a name/identifier change. The whole point of standardized measures is their immutability.