tmp/tmp8kq0cj9i/{from.md → to.md}
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#### Time zone database access <a id="time.zone.db.access">[[time.zone.db.access]]</a>
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``` cpp
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tzdb_list& get_tzdb_list();
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```
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*Effects:* If this is the first access to the time zone database,
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initializes the database. If this call initializes the database, the
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resulting database will be a `tzdb_list` holding a single initialized
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`tzdb`.
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*Synchronization:* It is safe to call this function from multiple
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threads at one time.
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*Returns:* A reference to the database.
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*Throws:* `runtime_error` if for any reason a reference cannot be
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returned to a valid `tzdb_list` containing one or more valid `tzdb`s.
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``` cpp
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const tzdb& get_tzdb();
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```
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*Returns:* `get_tzdb_list().front()`.
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``` cpp
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const time_zone* locate_zone(string_view tz_name);
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```
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*Returns:* `get_tzdb().locate_zone(tz_name)`.
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[*Note 1*: The time zone database will be initialized if this is the
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first reference to the database. — *end note*]
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``` cpp
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const time_zone* current_zone();
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```
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*Returns:* `get_tzdb().current_zone()`.
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