Red hat Linux + TIME ZONE CONFIGURATION + details from clock file
With the introduction of RHEL 7 the timezone is managed through systemd, which provides a custom utility to change the timezone:
To list all available time zones:
To actually change the time zone, (as root or using
timedatectl set-timezone time_zone
timedatectl set-timezone will not only make the modified time zone take effect immediately, but will also update the
/etc/localtime symlink to make that change persistent across reboots.
So the "correct" way to set the clock (at least prior to RHEL 7) is to edit
/etc/sysconfig/clock and then run
tzdata-update which will then update
/etc/localtime; you've just done that step manually.