cppdraft_translate/cppdraft/time/zone/db/tzdb.md

[time.zone.db.tzdb]

30 Time library [time]

30.11 Time zones [time.zone]

30.11.2 Time zone database [time.zone.db]

30.11.2.1 Class tzdb [time.zone.db.tzdb]

namespace std::chrono {struct tzdb { string version; vector<time_zone> zones; vector<time_zone_link> links; vector<leap_second> leap_seconds; const time_zone* locate_zone(string_view tz_name) const; const time_zone* current_zone() const; };}

1

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Each vector in a tzdb object is sorted to enable fast lookup.

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const time_zone* locate_zone(string_view tz_name) const;

2

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Returns:

• (2.1)

If zones contains an element tz for which tz.name() == tz_name, a pointer to tz;

• (2.2)

otherwise, if links contains an element tz_l for which tz_l.name() == tz_name, then a pointer to the element tz of zones for which tz.name() == tz_l.target().

[Note 1:

A time_zone_link specifies an alternative name for a time_zone.

— end note]

3

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Throws: If a const time_zone* cannot be found as described in the Returns: element, throws a runtime_error.

[Note 2:

On non-exceptional return, the return value is always a pointer to a valid time_zone.

— end note]

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const time_zone* current_zone() const;

4

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Returns: A pointer to the time zone which the computer has set as its local time zone.