Bug #71272 for DateTime: silly seconds value at leap second

$ perl -MDateTime -lwe '$dt=DateTime->new(year=>2008,month=>12,day=>31,hour=>23,minute=>59,second=>60, time_zone=>"UTC"); $dt->set_time_zone("+00:00:59"); print $dt' 2009-01-01T23:59:119 Only happens for a time located within a leap second, when combined with a timezone offset that is not an integral number of minutes. That's an inherently problematic combination, but giving a reading of 119 seconds into the minute is not an acceptable response. You could fudge it to give the same (sane) response as the preceding or following second, 00:00:58 or 00:00:59, or you could throw an exception. -zefram