The switch to daylight savings time

[Israel Pinkas]

In article <1991Apr10.114836.10816 at convex.com> andy at piziali.lonestar.org (Andy Piziali) writes:

> My question is: are the two dates which delimit the period of the year
> DST is in effect hard coded into the kernel and could these dates have
> differed from the current dates at the time this Xenix was written?  I
> believe the kernel was last altered in 1983 or 1984.  What else should I
> look at to find out why Xenix is not enabling DST?

Congress changed the date for switching to DT in 1987.  The old date was
the LAST Sunday in April.  The new date is the first Sunday in April.  The
October date was, and remains, the last Sunday.

Since the old way was in use since we started this batch of DT (in the
70s?), and nobody expected the rules to change, the kernel may have the
date hardcoded (as a rule).

There was a lot of discussion on this when Congress changed the date.  I
believe that most people favored a text file that dictates when to switch,
so that the rules could be updated as they changed.  My system (SVR4) has
files in /usr/lib/locale/TZ that appear to dictate rules for various
timezone info.

Hope this helps,

-Israel
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Disclaimer: The above are my personal opinions, and in no way represent
the opinions of Intel Corporation.  In no way should the above be taken
to be a statement of Intel.

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