[Zope] bobobase_modification_time one day back?

[Wolfgang Strobl]

Function TimeStamp_yad(int y) in
zope-2.1.4-src\lib\python\zodb\TimeStamp.c
expects a 1900 based year (i.e. 0 = 1900, 2000=100, etc.), 
for positive agruments, when computing (y+300)/400.

TimeStamp_abst(int y, int mo, int d, int m, int s)
seems to expect a 0 based year, on the other hand.

l = y%4==0 && (y%100 != 0 || y%400==0)

But it gets called with a 1900 based year in line 290 in 
function TimeStamp_timeTime(

            TimeStamp_abst(TimeStamp_y-1900, TimeStamp_m-
1, TimeStamp_d-1, 


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