27 Time library [time]

27.11 Time zones [time.zone]

27.11.6 Class template zoned_­traits [time.zone.zonedtraits]

namespace std::chrono {
  template<class T> struct zoned_traits {};
}
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zoned_­traits provides a means for customizing the behavior of zoned_­time<Duration, TimeZonePtr> for the zoned_­time default constructor, and constructors taking string_­view.
A specialization for const time_­zone* is provided by the implementation:
namespace std::chrono {
  template<> struct zoned_traits<const time_zone*> {
    static const time_zone* default_zone();
    static const time_zone* locate_zone(string_view name);
  };
}
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static const time_zone* default_zone();
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Returns: std​::​chrono​::​locate_­zone("UTC").
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static const time_zone* locate_zone(string_view name);
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Returns: std​::​chrono​::​locate_­zone(name).