I was browsing around the management website of a Samsung telephone system once, saw the DST settings and thought I would take a look. There were about seven lines, with text boxes for the month, day, year, hour, minute, second that a DST change would occur. I thought to myself, "what happens when these seven years have passed?"
Does the phone system update itself, or will our times suddenly be of because it has no entries for DST? Either way, that has to be the worst implementation of DST I have ever seen.