std::chrono::operator/(calendar) - cppreference.com (original) (raw)

These operator/ overloads provide a conventional syntax for the creation of Proleptic Gregorian calendar dates.

For creation of a full date, any of the following three orders are accepted:

• _year/month/day_,
• _month/day/year_,
• _day/month/year_.

In each case _day_ can replaced with one of:

• std::chrono::last, for the last day of the month;
• _weekday_[_i_], for the _i_th weekday of the month;
• _weekday_[std::chrono::last], for the last weekday of the month.

A plain integer is accepted if its meaning is unambiguous from the types of other operands: 2005y/4/5 is allowed, but 5/April/2005 is not.

Partial-date types (year_month, month_day, etc.) can be created by not applying the second operator/ in any of the three orders.

[edit] Return value

[edit] Example

#include using namespace std::chrono;   constexpr auto ym{2021y/8}; static_assert(ym == year_month(year(2021), August));   constexpr auto md{9/15d}; static_assert(md == month_day(September, day(15)));   constexpr auto mdl{October/last}; static_assert(mdl == month_day_last(month(10)));   constexpr auto mw{11/Monday[3]}; static_assert(mw == month_weekday(November, Monday[3]));   constexpr auto mwdl{December/Sunday[last]}; static_assert(mwdl == month_weekday_last(month(12), weekday_last(Sunday)));   // Those 3 year/month/day orders that people actually use on this planet and beyond: constexpr auto ymd{year(2021)/January/day(23)}; static_assert(ymd == month{1}/23/2021); static_assert(ymd == day{23}/1/2021); static_assert(ymd == year_month_day(2021y, month(January), 23d));   int main() {}