DateTime 0.17

on Perl CPAN

[ BACKWARDS INCOMPATIBILITIES ]

• The default end_of_month mode for negative durations is now
  "preserve". This makes more sense, as the previous default meant
  that the following code:
  

print DateTime->new( year => 2003, month => 5, day => 31 )

            ->subtract( months => 1 )->ymd;

printed "2003-05-01" as opposed to "2003-04-30". Thanks to Thomas
Klausner for starting a discussion on this problem.