Re: [HACKERS] [OT] Timezones and Daylight savings.

> Could one of you kinds soul point me to the PostgreSQL code for 
> determining Timezones and Daylight Savings. 

backend/utils/adt/{dt.c,nabstime.c}

> If I can assess the OS's database that would be best.

Not sure what you mean here. As a guess, you should look at the
utility "zdump", which will show you the transition times for ST/DST.
You can set the TZ environment variable (or PGTZ envar when running
Postgres) to test out different time zones, which is how I can test
bug reports from other parts of the world.

                      - Tom