Defined in header
Compares the two
zoned_time objects compare equal if their time points and time zone pointers both compare equal according to
!= operator is synthesized from
 Return value
x.get_time_zone() == y.get_time_zone() && x.get_sys_time() == y.get_sys_time(), except that the comparisons are performed on the nonstatic data members of
y directly and no copying is performed.