For purposes of addressing time zones, Universal Co-ordinated
Time is also known as Greenwich Mean Time (GMT).
If Fedora is the only operating system on your computer, select
System clock uses UTC. The system clock is a
piece of hardware on your computer system. Fedora uses the timezone
setting to determine the offset between the local time and UTC on
the system clock. This behavior is standard for UNIX-like
Windows and the System Clock
Do not enable the System clock uses UTC
option if your machine also runs Microsoft Windows. Microsoft
operating systems change the BIOS clock to match local time
rather than UTC. This may cause unexpected behavior under Fedora.