Could it be possible that the skew formula might be wrong?

[catalinus]

Could it be possible that the skew formula might be wrong? More precisely if BASE_YEAR is 2001 then (pdate->year - BASE_YEAR)/4 does not kick in leap years but 1 year after, so it should be something like:

define BASE_YEAR 2001

u8 skew;
skew = (pdate->year - BASE_YEAR)+(pdate->year - BASE_YEAR + 1)/4;

(easy test - set date to January 1st 2012, it should be SUN and not SAT).