ccyymmdd.cpp

#include <iostream>
#include "NewDateTime.h"
#include "boost/date_time/gregorian/formatters.hpp"
#include "boost/date_time/gregorian/parsers.hpp"
#include "boost/date_time/posix_time/posix_time.hpp"
#include "boost/date_time/c_local_time_adjustor.hpp"

using namespace boost::gregorian;
using namespace std;

using namespace boost::posix_time;

NEWDATETIMEFNC char ccyymmdd_error_buffer[256];

NEWDATETIMEFNC void STDCALL copy_to_error_buffer( exception& e) {
  if (strlen( e.what()) > 256) {
    memcpy( ccyymmdd_error_buffer, e.what(), 254);
    ccyymmdd_error_buffer[254]=0;
  } else {
    strcpy( ccyymmdd_error_buffer, e.what());
  }
}

NEWDATETIMEFNC int STDCALL day_diff( int iso_lhs, int iso_rhs) {
  ostringstream ss;
  ss << iso_lhs;

  try {
    date dt_lhs( date_from_iso_string( ss.str()));

    ss.str( "");
    ss << iso_rhs;
    try {
      date dt_rhs( date_from_iso_string( ss.str()));
  
      date_duration df = dt_lhs - dt_rhs;

      return df.days();

    } catch (exception &e) {
      copy_to_error_buffer( e);
      return -1;
    }
  } catch (exception &e) {
    copy_to_error_buffer( e);
    return -1;
  }
}

NEWDATETIMEFNC int STDCALL serial_time( int iso_lhs) {
  return day_diff( iso_lhs, 19800101);
}

NEWDATETIMEFNC int STDCALL week_day( int iso_lhs) {
  int wday =  day_diff( iso_lhs, 19800106) % 7;
  if (wday < 0) wday += 7;
  return wday;
}
  
#if defined( DEBUGALONE)

int main() {
  int lhs = 20070420, rhs = 20070127;
  
  int period = day_diff( lhs, rhs);

  cout << "day_diff( 20070420, 20070127) = " << period << endl;

  period = serial_time( 20080211);
  cout << "serial_time( 20080211) = " << period << endl;

  period = week_day( 20080211);
  cout << "serial_time( 20080211) = " << period << endl;

  try {
    period = serial_time( 99999999);
  } catch (exception & e) {
    cout << "exception caught = {" << e.what() << "}" << endl;
  }

  cout << "serial_time( 99999999) = " << period << endl;
  cout << "ccyymmdd_error_buffer={" << ccyymmdd_error_buffer << "}" << endl;

  return 0;
}

#endif

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