I am using boost gregorian library for date calculation in c++ boost gregorian returns week number in ISO format but I want week number in US format.
how I can get week number in US format.
please see link https://planetcalc.com/1252/
e.g.
#include <boost/date_time/gregorian/gregorian.hpp>
int main(int argc, char* argv[])
{
boost::gregorian::date myday1 = boost::gregorian::from_simple_string("2005-1-1");
int weekNum1 = myday1.week_number(); //return ISO which is 53 //week 1 as US method
boost::gregorian::date myday2 = boost::gregorian::from_simple_string("2005-1-2");
int weekNum2 = myday2.week_number(); //return ISO which is 53 //week 2 as US method
return 0;
}
Using visual studio 2019 community on windows 10
Answer
I find no direct way in C++ or any library which support US method for week number, So I have to use CLR dll and call it from native C++.
//Header file #pragma once __declspec(dllexport) int GetWeekNumber(int year, int month, int day);
C++/CLI File
#include "pch.h"
#include "CLRDll.h"
using namespace System;
using namespace System::Globalization;
namespace CLRDll
{
public ref class CCalender
{
static CultureInfo^ cinfo = gcnew CultureInfo("en-US");
static Calendar^ cal = cinfo->Calendar;
// Gets the DTFI properties required by GetWeekOfYear.
static CalendarWeekRule^ myCWR = cinfo->DateTimeFormat->CalendarWeekRule;
static DayOfWeek^ myFirstDOW = cinfo->DateTimeFormat->FirstDayOfWeek;
public:
int GetWeekNumber(int year, int month, int day);
// TODO: Add your methods for this class here.
};
}
int CLRDll::CCalender::GetWeekNumber(int year, int month, int day)
{
DateTime^ dt = gcnew DateTime(year, month, day);
return cal->GetWeekOfYear(*dt, *myCWR, *myFirstDOW);
}
__declspec(dllexport) int GetWeekNumber(int year, int month, int day)
{
CLRDll::CCalender c;
return c.GetWeekNumber(year, month, day);
}