CodeCogs

Computes the day of the week (Sunday through to Monday), for the specified serial Julian date.

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Interface

#include <codecogs/units/date/dayofweek.h>

using namespace Units::Date;

inline int dayOfWeek(int nDate, int type=1)

Calculates the week day from a serial Julian date. This is correct for both the Gregorian and Julian calendar. The solution is merely:

$DayOfWeek = (nDate+1)\ mod\ 7 + 1$

(1)

Example 1

#include <stdio.h>
#include <codecogs/units/date/dayofweek.h>
#include <codecogs/units/date/date.h>
using namespace Units::Date;

int main()
{
  for(int i=10;i<20;i++)
  {
    int adate=date(2004, 10, i);
    printf("\n %d October 2004 is %d day of week", i, dayOfWeek(adate));
  }
  return 0;
}

Parameters

nDate

is a serial number of days from 24 November 4714 BC (1 January 4713BC in the Julian Calendar) - also known as the Julian Period.

type

defines the output style for the day of the week

Blank

Type=1 (default) : return contains numbers 1 (Sunday) through 7 (Saturday).
Type=2 : return contains numbers 1 (Monday) through 7 (Sunday).
Type=3 : return contains numbers 0 (Monday) through 6 (Sunday).

Interactive Calculator

nDate

type

Result –