Next, the installation program presents a dialog to help you configure your Red Hat Linux system's timezone (see Figure 33).
If you wish to set the hardware (CMOS) clock to GMT (Greenwich Mean Time, also known as UTC, or Coordinated Universal Time), select Hardware clock set to GMT. Setting your hardware clock to GMT means your Red Hat Linux system will properly handle daylight savings time, if your timezone uses it. Most networks use GMT.
Select the timezone your system will be operating in from the list, and press [Enter].
If you wish to change your timezone configuration after you have booted your Red Hat Linux system, you may use the /usr/sbin/timeconfig command.