004+ test_years_positive__6_shy_1_day: SUB: 2007-02-06 00:00:00 EST - P+6Y11M30DT0H0M0S = **2000-02-05 00:00:00 EST**
004- test_years_positive__6_shy_1_day: SUB: 2007-02-06 00:00:00 EST - P+6Y11M30DT0H0M0S = **2000-02-07 00:00:00 EST**
012+ test_years_negative__6_shy_1_day: SUB: 2000-02-07 00:00:00 EST - P-6Y11M28DT0H0M0S = **2007-02-04 00:00:00 EST**
012- test_years_negative__6_shy_1_day: SUB: 2000-02-07 00:00:00 EST - P-6Y11M28DT0H0M0S = **2007-02-06 00:00:00 EST**