30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.18 Conventional syntax operators [time.cal.operators]

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A set of overloaded operator/ functions provides a conventional syntax for the creation of civil calendar dates.
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[Note 1: 
The year, month, and day are accepted in any of the following 3 orders: year/month/day month/day/year day/month/year
Anywhere a day is needed, any of the following can also be specified: last weekday[i] weekday[last]
— end note]
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[Note 2: 
Partial-date types such as year_month and month_day can be created by not applying the second division operator for any of the three orders.
For example: year_month ym = 2015y/April; month_day md1 = April/4; month_day md2 = 4d/April;
— end note]
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[Example 1: auto a = 2015/4/4; // a == int(125) auto b = 2015y/4/4; // b == year_month_day{year(2015), month(4), day(4)} auto c = 2015y/4d/April; // error: no viable operator/ for first / auto d = 2015/April/4; // error: no viable operator/ for first / — end example]
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constexpr year_month operator/(const year& y, const month& m) noexcept;
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Returns: {y, m}.
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constexpr year_month operator/(const year& y, int m) noexcept;
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Returns: y / month(m).
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constexpr month_day operator/(const month& m, const day& d) noexcept;
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Returns: {m, d}.
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constexpr month_day operator/(const month& m, int d) noexcept;
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Returns: m / day(d).
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constexpr month_day operator/(int m, const day& d) noexcept;
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Returns: month(m) / d.
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constexpr month_day operator/(const day& d, const month& m) noexcept;
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Returns: m / d.
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constexpr month_day operator/(const day& d, int m) noexcept;
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Returns: month(m) / d.
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constexpr month_day_last operator/(const month& m, last_spec) noexcept;
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Returns: month_day_last{m}.
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constexpr month_day_last operator/(int m, last_spec) noexcept;
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Returns: month(m) / last.
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constexpr month_day_last operator/(last_spec, const month& m) noexcept;
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Returns: m / last.
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constexpr month_day_last operator/(last_spec, int m) noexcept;
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Returns: month(m) / last.
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constexpr month_weekday operator/(const month& m, const weekday_indexed& wdi) noexcept;
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Returns: {m, wdi}.
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constexpr month_weekday operator/(int m, const weekday_indexed& wdi) noexcept;
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Returns: month(m) / wdi.
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constexpr month_weekday operator/(const weekday_indexed& wdi, const month& m) noexcept;
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Returns: m / wdi.
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constexpr month_weekday operator/(const weekday_indexed& wdi, int m) noexcept;
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Returns: month(m) / wdi.
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constexpr month_weekday_last operator/(const month& m, const weekday_last& wdl) noexcept;
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Returns: {m, wdl}.
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constexpr month_weekday_last operator/(int m, const weekday_last& wdl) noexcept;
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Returns: month(m) / wdl.
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constexpr month_weekday_last operator/(const weekday_last& wdl, const month& m) noexcept;
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Returns: m / wdl.
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constexpr month_weekday_last operator/(const weekday_last& wdl, int m) noexcept;
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Returns: month(m) / wdl.
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constexpr year_month_day operator/(const year_month& ym, const day& d) noexcept;
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Returns: {ym.year(), ym.month(), d}.
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constexpr year_month_day operator/(const year_month& ym, int d) noexcept;
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Returns: ym / day(d).
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constexpr year_month_day operator/(const year& y, const month_day& md) noexcept;
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Returns: y / md.month() / md.day().
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constexpr year_month_day operator/(int y, const month_day& md) noexcept;
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Returns: year(y) / md.
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constexpr year_month_day operator/(const month_day& md, const year& y) noexcept;
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Returns: y / md.
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constexpr year_month_day operator/(const month_day& md, int y) noexcept;
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Returns: year(y) / md.
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constexpr year_month_day_last operator/(const year_month& ym, last_spec) noexcept;
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Returns: {ym.year(), month_day_last{ym.month()}}.
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constexpr year_month_day_last operator/(const year& y, const month_day_last& mdl) noexcept;
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Returns: {y, mdl}.
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constexpr year_month_day_last operator/(int y, const month_day_last& mdl) noexcept;
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Returns: year(y) / mdl.
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constexpr year_month_day_last operator/(const month_day_last& mdl, const year& y) noexcept;
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Returns: y / mdl.
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constexpr year_month_day_last operator/(const month_day_last& mdl, int y) noexcept;
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Returns: year(y) / mdl.
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constexpr year_month_weekday operator/(const year_month& ym, const weekday_indexed& wdi) noexcept;
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Returns: {ym.year(), ym.month(), wdi}.
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constexpr year_month_weekday operator/(const year& y, const month_weekday& mwd) noexcept;
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Returns: {y, mwd.month(), mwd.weekday_indexed()}.
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constexpr year_month_weekday operator/(int y, const month_weekday& mwd) noexcept;
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Returns: year(y) / mwd.
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constexpr year_month_weekday operator/(const month_weekday& mwd, const year& y) noexcept;
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Returns: y / mwd.
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constexpr year_month_weekday operator/(const month_weekday& mwd, int y) noexcept;
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Returns: year(y) / mwd.
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constexpr year_month_weekday_last operator/(const year_month& ym, const weekday_last& wdl) noexcept;
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Returns: {ym.year(), ym.month(), wdl}.
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constexpr year_month_weekday_last operator/(const year& y, const month_weekday_last& mwdl) noexcept;
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Returns: {y, mwdl.month(), mwdl.weekday_last()}.
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constexpr year_month_weekday_last operator/(int y, const month_weekday_last& mwdl) noexcept;
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Returns: year(y) / mwdl.
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constexpr year_month_weekday_last operator/(const month_weekday_last& mwdl, const year& y) noexcept;
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Returns: y / mwdl.
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constexpr year_month_weekday_last operator/(const month_weekday_last& mwdl, int y) noexcept;
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Returns: year(y) / mwdl.