std::chrono:: operator/ (calendar)

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
Date and time utilities
Time point
(C++11)
(C++20)
Duration
(C++11)
Clocks
(C++20)
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(C++20)
Time of day
(C++20) (C++20)
(C++20) (C++20)
(C++20)

Calendar
(C++20)
(C++20)
(C++20)
(C++20)
operator/
(C++20)
(C++20)
Time zone
(C++20)
(C++20)
(C++20) (C++20) (C++20) (C++20)
(C++20)
chrono I/O
(C++20)
C-style date and time
Defined in header <chrono>
year_month
constexpr auto operator / ( const std:: chrono :: year & y,

const std:: chrono :: month & m ) noexcept

- > std:: chrono :: year_month ;
(1) (since C++20)
constexpr auto operator / ( const std:: chrono :: year & y, int m ) noexcept
- > std:: chrono :: year_month ;
(2) (since C++20)
month_day
constexpr auto operator / ( const std:: chrono :: month & m,

const std:: chrono :: day & d ) noexcept

- > std:: chrono :: month_day ;
(3) (since C++20)
constexpr auto operator / ( const std:: chrono :: month & m, int d ) noexcept
- > std:: chrono :: month_day ;
(4) (since C++20)
constexpr auto operator / ( int m, const std:: chrono :: day & d ) noexcept
- > std:: chrono :: month_day ;
(5) (since C++20)
constexpr auto operator / ( const std:: chrono :: day & d,

const std:: chrono :: month & m ) noexcept

- > std:: chrono :: month_day ;
(6) (since C++20)
constexpr auto operator / ( const std:: chrono :: day & d, int m ) noexcept
- > std:: chrono :: month_day ;
(7) (since C++20)
month_day_last
(8) (since C++20)
constexpr auto operator / ( int m, std:: chrono :: last_spec ) noexcept
- > std:: chrono :: month_day_last ;
(9) (since C++20)
constexpr auto operator / ( std:: chrono :: last_spec ,

const std:: chrono :: month & m ) noexcept

- > std:: chrono :: month_day_last ;
(10) (since C++20)
constexpr auto operator / ( std:: chrono :: last_spec , int m ) noexcept
- > std:: chrono :: month_day_last ;
(11) (since C++20)
month_weekday
constexpr auto operator / ( const std:: chrono :: month & m,

const std:: chrono :: weekday_indexed & wdi ) noexcept

- > std:: chrono :: month_weekday ;
(12) (since C++20)
constexpr auto operator / ( int m, const std:: chrono :: weekday_indexed & wdi ) noexcept
- > std:: chrono :: month_weekday ;
(13) (since C++20)
constexpr auto operator / ( const std:: chrono :: weekday_indexed & wdi,

const std:: chrono :: month & m ) noexcept

- > std:: chrono :: month_weekday ;
(14) (since C++20)
constexpr auto operator / ( const std:: chrono :: weekday_indexed & wdi, int m ) noexcept
- > std:: chrono :: month_weekday ;
(15) (since C++20)
month_weekday_last
constexpr auto operator / ( const std:: chrono :: month & m,

const std:: chrono :: weekday_last & wdl ) noexcept

- > std:: chrono :: month_weekday_last ;
(16) (since C++20)
constexpr auto operator / ( int m, const std:: chrono :: weekday_last & wdl ) noexcept
- > std:: chrono :: month_weekday_last ;
(17) (since C++20)
constexpr auto operator / ( const std:: chrono :: weekday_last & wdl,

const std:: chrono :: month & m ) noexcept

- > std:: chrono :: month_weekday_last ;
(18) (since C++20)
constexpr auto operator / ( const std:: chrono :: weekday_last & wdl, int m ) noexcept
- > std:: chrono :: month_weekday_last ;
(19) (since C++20)
year_month_day
constexpr auto operator / ( const std:: chrono :: year_month & ym,

const std:: chrono :: day & d ) noexcept

- > std:: chrono :: year_month_day ;
(20) (since C++20)
constexpr auto operator / ( const std:: chrono :: year_month & ym, int d ) noexcept
- > std:: chrono :: year_month_day ;
(21) (since C++20)
constexpr auto operator / ( const std:: chrono :: year & y,

const std:: chrono :: month_day & md ) noexcept

- > std:: chrono :: year_month_day ;
(22) (since C++20)
constexpr auto operator / ( int y, const std:: chrono :: month_day & md ) noexcept
- > std:: chrono :: year_month_day ;
(23) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_day & md,

const std:: chrono :: year & y ) noexcept

- > std:: chrono :: year_month_day ;
(24) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_day & md, int y ) noexcept
- > std:: chrono :: year_month_day ;
(25) (since C++20)
year_month_day_last
(26) (since C++20)
constexpr auto operator / ( const std:: chrono :: year & y,

const std:: chrono :: month_day_last & mdl ) noexcept

- > std:: chrono :: year_month_day_last ;
(27) (since C++20)
constexpr auto operator / ( int y, const std:: chrono :: month_day_last & mdl ) noexcept
- > std:: chrono :: year_month_day_last ;
(28) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_day_last & mdl,

const std:: chrono :: year & y ) noexcept

- > std:: chrono :: year_month_day_last ;
(29) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_day_last & mdl, int y ) noexcept
- > std:: chrono :: year_month_day_last ;
(30) (since C++20)
year_month_weekday
constexpr auto operator / ( const std:: chrono :: year_month & ym,

const std:: chrono :: weekday_indexed & wdi ) noexcept

- > std:: chrono :: year_month_weekday ;
(31) (since C++20)
constexpr auto operator / ( const std:: chrono :: year & y,

const std:: chrono :: month_weekday & mwd ) noexcept

- > std:: chrono :: year_month_weekday ;
(32) (since C++20)
constexpr auto operator / ( int y, const std:: chrono :: month_weekday & mwd ) noexcept
- > std:: chrono :: year_month_weekday ;
(33) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_weekday & mwd,

const std:: chrono :: year & y ) noexcept

- > std:: chrono :: year_month_weekday ;
(34) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_weekday & mwd, int y ) noexcept
- > std:: chrono :: year_month_weekday ;
(35) (since C++20)
year_month_weekday_last
constexpr auto operator / ( const std:: chrono :: year_month & ym,

const std:: chrono :: weekday_last & wdl ) noexcept

- > std:: chrono :: year_month_weekday_last ;
(36) (since C++20)
constexpr auto operator / ( const std:: chrono :: year & y,

const std:: chrono :: month_weekday_last & mwdl ) noexcept

- > std:: chrono :: year_month_weekday_last ;
(37) (since C++20)
constexpr auto operator / ( int y, const std:: chrono :: month_weekday_last & mwdl ) noexcept
- > std:: chrono :: year_month_weekday_last ;
(38) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_weekday_last & mwdl,

const std:: chrono :: year & y ) noexcept

- > std:: chrono :: year_month_weekday_last ;
(39) (since C++20)
constexpr auto operator / ( const std:: chrono :: month_weekday_last & mwdl, int y ) noexcept
- > std:: chrono :: year_month_weekday_last ;
(40) (since C++20)

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.

Return value

1) std:: chrono :: year_month ( y, m )
2) std:: chrono :: year_month ( y, std:: chrono :: month ( m ) )
3,6) std:: chrono :: month_day ( m, d )
4) std:: chrono :: month_day ( m, std:: chrono :: day ( d ) )
5,7) std:: chrono :: month_day ( std:: chrono :: month ( m ) , d )
8,10) std:: chrono :: month_day_last ( m )
9,11) std:: chrono :: month_day_last ( std:: chrono :: month ( m ) )
12,14) std:: chrono :: month_weekday ( m, wdi )
13,15) std:: chrono :: month_weekday ( std:: chrono :: month ( m ) , wdi )
16,18) std:: chrono :: month_weekday_last ( m, wdl )
17,19) std:: chrono :: month_weekday_last ( std:: chrono :: month ( m ) , wdl )
20) std:: chrono :: year_month_day ( ym. year ( ) , ym. month ( ) , d )
21) std:: chrono :: year_month_day ( ym. year ( ) , ym. month ( ) , std:: chrono :: day ( d ) )
22,24) std:: chrono :: year_month_day ( y, md. month ( ) , md. day ( ) )
23,25) std:: chrono :: year_month_day ( std:: chrono :: year ( y ) , md. month ( ) , md. day ( ) )
26) std:: chrono :: year_month_day_last ( ym. year ( ) , std:: chrono :: month_day_last ( ym. month ( ) ) )
27,29) std:: chrono :: year_month_day_last ( y, mdl )
28,30) std:: chrono :: year_month_day_last ( std:: chrono :: year ( y ) , mdl )
31) std:: chrono :: year_month_weekday ( ym. year ( ) , ym. month ( ) , wdi )
32,34) std:: chrono :: year_month_weekday ( y, mwd. month ( ) , mwd. weekday_indexed ( ) )
33,35) std:: chrono :: year_month_weekday ( std:: chrono :: year ( y ) , mwd. month ( ) , mwd. weekday_indexed ( ) )
36) std:: chrono :: year_month_weekday_last ( ym. year ( ) , ym. month ( ) , wdl )
37,39) std:: chrono :: year_month_weekday_last ( y, mwdl. month ( ) , mwdl. weekday_last ( ) )
38,40) std:: chrono :: year_month_weekday_last ( std:: chrono :: year ( y ) , mwdl. month ( ) , mwdl. weekday_last ( ) )

Example

Run this code 
#include <chrono>
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() {}
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