epoch from date field

When extracting the epoch from a date:

select extract(epoch from date(map_date)) from datemaps;

For a date: 2002-07-04
it returns 1025740800
which apparently translates to today (7/3) at 5pm.  Is this right?
Shouldn't it return the epoch for midnight on 7/4?

Thanks,

--
Laurett Cisneros
The Database Group
(510) 420-3137
NextBus Information Systems, Inc.
www.nextbus.com
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"Intelligence complicates. Wisdom simplifies."
  -- Mason Cooley