days_in_month() [2/2]

static int32 xtd::date_time::days_in_month ( uint32  year, uint32  month  )

static

Returns the number of days in the specified month and year.

Parameters

year	The year.
month	The month (a number ranging from 1 to 12).

Returns

The number of days in month for the specified year.
For example, if month equals 2 for February, the return value is 28 or 29 depending upon whether year is a leap year.

Exceptions

xtd::argument_out_of_range_exception

month is less than 1 or greater than 12. -or- year is less than 1 or greater than 9999.

Examples

The following example demonstrates how to use the xtd::date_time::days_in_month method to determine the number of days in July 2001, February 1998 (a non-leap year), and February 1996 (a leap year).

#include <xtd/console>
#include <xtd/date_time>
#include <xtd/startup>
 
class program {
public:
  static auto main() {
    auto days_in_july = xtd::date_time::days_in_month(2001, xtd::month_of_year::july);
    xtd::console::write_line(days_in_july);
    
    // days_in_feb gets 28 because the year 1998 was not a leap year.
    auto days_in_feb = xtd::date_time::days_in_month(1998, xtd::month_of_year::february);
    xtd::console::write_line(days_in_feb);
    
    // days_in_feb_leap gets 29 because the year 1996 was a leap year.
    auto days_in_feb_leap = xtd::date_time::days_in_month(1996, xtd::month_of_year::february);
    xtd::console::write_line(days_in_feb_leap);
  }
};
 
startup_(program::main);
 
// This code produces the following output :
//
// 31
// 28
// 29

Examples

The following example displays the number of days in each month of a year specified in an integer array.

#include <xtd/as>
#include <xtd/console>
#include <xtd/date_time>
#include <xtd/startup>
#include <array>
 
using namespace xtd;
 
class program {
public:
  static auto main() {
    auto years = std::array<unsigned int, 2> {2012, 2014};
    console::write_line("Days in the Month for the Gregorian calendar\n");
    console::write_line("{0,-10}{1,-15}{2,4}\n", "Year", "Month", "Days");
    
    for (auto year : years) {
      for (auto ctr = 1u; ctr <= 12u; ctr++)
        console::write_line("{0,-10}{1,-15}{2,4}", year, as<month_of_year>(ctr), date_time::days_in_month(year, ctr));
      console::write_line();
    }
  }
};
 
startup_(program::main);
 
// This code produces the following output :
//
//  Days in the Month for the en-US culture using the Gregorian calendar
//
//  Year      Month          Days
//
//  2012      january          31
//  2012      february         29
//  2012      march            31
//  2012      april            30
//  2012      may              31
//  2012      june             30
//  2012      july             31
//  2012      august           31
//  2012      september        30
//  2012      october          31
//  2012      november         30
//  2012      december         31
//
//  2014      january          31
//  2014      february         28
//  2014      march            31
//  2014      april            30
//  2014      may              31
//  2014      june             30
//  2014      july             31
//  2014      august           31
//  2014      september        30
//  2014      october          31
//  2014      november         30
//  2014      december         31

Remarks

The xtd::date_time::days_in_month method always interprets month and year as the month and year of the Gregorian calendar.