timestamp cast to abstime problem

Does anyone know why this returns 0 and not 3600?test=> select '1970-01-01 01:00:00'::timestamp::abstime::int4; int4
------   0(1 row)
 

My time(2) manual page says:
    The time() function returns the value of time in seconds since 0    hours, 0 minutes, 0 seconds, January 1, 1970,
CoordinatedUniversal Time.
 

Also, why does my TimeZone show as Poland?test=> SHOW TimeZone; TimeZone ---------- Poland(1 row)

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