Corinna Vinschen wrote:
>... you might consider to debug the tzset tool ...
The cygwin tzset program is OK.
The problem was caused by a non-standard TZ-regestry
produced by an non-official patch that I applied few
years ago when the venezuelan legal time zone was
change from GMT-4:00 to GMT-4:30, that at that time was not
supported by Microsoft. With the official Microsoft tz patch
everything is OK.