std::hash<std::chrono::zoned_time>
From cppreference.com
                    
                                        
                    < cpp | chrono | zoned time
                    
                                                            
                    |   Defined in header  <chrono>
  | 
||
|   template< class Duration, class TimeZonePtr > struct hash<std::chrono::zoned_time<Duration, TimeZonePtr>>;  | 
(since C++26) | |
The template specialization of std::hash for std::chrono::zoned_time allows users to obtain hashes of objects of type std::chrono::zoned_time<Duration, TimeZonePtr>. This specialization is enabled if and only if both std::hash<Duration> and std::hash<TimeZonePtr> are enabled.
Notes
| Feature-test macro | Value | Std | Feature | 
|---|---|---|---|
__cpp_lib_chrono | 
202306L | (C++26) | Hashing support for std::chrono value classes
 | 
See also
|    (C++11)  | 
  hash function object  (class template)  |