Remove unused _day and _month attrs (pandas-dev#17431)

jbrockmendel · jbrockmendel · commit d8ea8f4982f1 · 2017-09-07T19:49:30.000-07:00
closes pandas-dev#17429
diff --git a/pandas/_libs/tslib.pyx b/pandas/_libs/tslib.pyx
@@ -831,8 +831,6 @@ class NaTType(_NaT):
         cdef _NaT base
 
         base = _NaT.__new__(cls, 1, 1, 1)
-        base._day = -1
-        base._month = -1
         base.value = NPY_NAT
 
         return base
