timezone() with timeofday() converts the wrong direction?

These attempts were run at 4/21/2005 13:15:00 -07.
UTC: 4/21/2005 20:15:00

SELECT timeofday()::timestamp
04/21/2005 13:15:00

SELECT timezone('UTC', now())
04/21/2005 20:15:00 PM

SELECT timezone('UTC', timeofday()::timestamp)::timestamp without time zone
04/21/2005 06:15:00 <- What the heck is this?!


Why does the conversion to UTC using timeofday() go wrong? It seems like the
conversion went 7 hours in the wrong direction. Did I forget a parameter or
switch somewhere?

Thanks,
Steve