cppdraft_translate/cppdraft/time/zone/leap/overview.md

[time.zone.leap.overview]

30 Time library [time]

30.11 Time zones [time.zone]

30.11.8 Class leap_second [time.zone.leap]

30.11.8.1 Overview [time.zone.leap.overview]

namespace std::chrono {class leap_second {public: leap_second(const leap_second&) = default; leap_second& operator=(const leap_second&) = default; // unspecified additional constructorsconstexpr sys_seconds date() const noexcept; constexpr seconds value() const noexcept; };}

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Objects of type leap_second representing the date and value of the leap second insertions are constructed and stored in the time zone database when initialized.

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[Example 1: for (auto& l : get_tzdb().leap_seconds)if (l <= sys_days{2018y/March/17d}) cout << l.date() << ": " << l.value() << '\n';

Produces the output:

1972-07-01 00:00:00: 1s
1973-01-01 00:00:00: 1s
1974-01-01 00:00:00: 1s
1975-01-01 00:00:00: 1s
1976-01-01 00:00:00: 1s
1977-01-01 00:00:00: 1s
1978-01-01 00:00:00: 1s
1979-01-01 00:00:00: 1s
1980-01-01 00:00:00: 1s
1981-07-01 00:00:00: 1s
1982-07-01 00:00:00: 1s
1983-07-01 00:00:00: 1s
1985-07-01 00:00:00: 1s
1988-01-01 00:00:00: 1s
1990-01-01 00:00:00: 1s
1991-01-01 00:00:00: 1s
1992-07-01 00:00:00: 1s
1993-07-01 00:00:00: 1s
1994-07-01 00:00:00: 1s
1996-01-01 00:00:00: 1s
1997-07-01 00:00:00: 1s
1999-01-01 00:00:00: 1s
2006-01-01 00:00:00: 1s
2009-01-01 00:00:00: 1s
2012-07-01 00:00:00: 1s
2015-07-01 00:00:00: 1s
2017-01-01 00:00:00: 1s

— end example]