This is to compensate for a missing feature in the OS/2 System Clock.
The system's internal date/time record contains a "time zone" field, but
the value in that field always shows up as "undefined" unless a program
like TZset puts a value there. (And the "System Clock" object properties notebook is missing the "time zone" tab that one would expect to see
there.) In practice many programs compensate by parsing the TZ
environment variable, but that is needless duplication.
In addition to putting a valid timezone value into the record returned
by the API call DosGetDateTime, TZset adjusts that value when summer
time starts or ends.
Version 7 of the program has the following changes:
Changed the "US default rules" to reflect changes to the
summer time start and end dates for those states that
respect the federal standard.
Fixed: start/end dates for the following year were
incorrect. Those dates were relevant for any case
where the summer is already over.
Display change: the screen output messages use more
human-friendly date formats than the internal format.
Display change: we don't display the minutes until the
next change unless it is really close. Before that we
display hours or days, as appropriate.
Added an icon.
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