[time.zone.db.access]

tzdb_list& get_tzdb_list();

Effects: If this is the first access to the time zone database, initializes the database.

If this call initializes the database, the resulting database will be a tzdb_list holding a single initialized tzdb.

Throws: runtime_error if for any reason a reference cannot be returned to a valid tzdb_list containing one or more valid tzdbs.

const tzdb& get_tzdb();

Returns: get_tzdb_list().front().

const time_zone* locate_zone(string_view tz_name);

[Note 1:

The time zone database will be initialized if this is the first reference to the database.

— end note]

const time_zone* current_zone();

Returns: get_tzdb().current_zone().

30 Time library [time]