Lpc2000

The RTC day-of-week (DOW) register does not appear to automatically
reflect the correct day of the week based on a correctly set month,
day-of-month, year in the RTC.  Is this calculation supposed to be
done automatically in the RTC or is it just a modulo 7 counter (i.e.
do I need to set it to the correct day of week when I set the RTC date?)