The following bug has been logged on the website:
Bug reference: 6340
Logged by: Hans-Henrik Fuxelius
Email address: hfuxelius@gmail.com
PostgreSQL version: 9.1.1
Operating system: Ubuntu 11.10
Description:=20=20=20=20=20=20=20=20
test to run: select to_timestamp('2011,03,27,02,11,11',
'YYYY,MM,DD,HH24,MI,SS')
and the run: select to_timestamp('2011,03,27,03,11,11',
'YYYY,MM,DD,HH24,MI,SS')
It miscalculates 02 hour to 03 hour by some reason