[time.zone.info.local]

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namespace std::chrono { struct local_info { static constexpr int unique = 0; static constexpr int nonexistent = 1; static constexpr int ambiguous = 2; int result; sys_info first; sys_info second; }; }

[Note 1:

This type provides a low-level interface to time zone information.

Typical conversions from local_time to sys_time will use this class implicitly, not explicitly.

— end note]

Describes the result of converting a local_time to a sys_time as follows:

(2.1)
When a local_time to sys_time conversion is unique, result == unique, first will be filled out with the correct sys_info, and second will be zero-initialized.
(2.2)
If the conversion stems from a nonexistent local_time then result == nonexistent, first will be filled out with the sys_info that ends just prior to the local_time, and second will be filled out with the sys_info that begins just after the local_time.
(2.3)
If the conversion stems from an ambiguous local_time, then result == ambiguous, first will be filled out with the sys_info that ends just after the local_time, and second will be filled out with the sys_info that starts just before the local_time.

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template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const local_info& r);

29 Time library [time]

29.11 Time zones [time.zone]

29.11.4 Information classes [time.zone.info]

29.11.4.2 Class local_info [time.zone.info.local]