std::chrono::operator ==,!= (std::chrono::zoned_time)
| template <class Duration1, class Duration2, class TimeZonePtr>
bool operator==(const std::chrono::zoned_time<Duration1, TimeZonePtr>& x,
                const std::chrono::zoned_time<Duration2, TimeZonePtr>& y); | (since C++20) | |
| template <class Duration1, class Duration2, class TimeZonePtr>
bool operator!=(const std::chrono::zoned_time<Duration1, TimeZonePtr>& x,
                const std::chrono::zoned_time<Duration2, TimeZonePtr>& y); | (since C++20) | 
Compares the two zoned_time objects x and y. Two zoned_time objects compare equal if their time points and time zone pointers both compare equal according to operator==.
Return value
1) 
 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 x and y directly and no copying is performed.
2) 
          !(x == y)
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