uct VS. local time in slackware

[Adam Myrow]

The way it works is that when you select UTC, Slackware writes a file in
/etc called localtime containing the word "UTC."  It checks this on
startup and shutdown and invokes hwclock with a special flag to let it
know that it is set to UTC and makes it act appropriately.  The easiest
way to switch back and forth, is to type "timeconfig" as root.  This will
repeat the setting of your timezone and you can then pick UTC.  You'll
still have to select a local time, but the clock should first be set to
UTC to get it to show up right.