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Calculates the date of Easter Sunday for the given year. <span align="right" style="background-color:9999FF"><strong>Open Office: EASTERSUNDAY</strong></span>

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Interface

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

using namespace Units::Date;

inline int easterSunday(int year)
std::string easterSunday_str(int year)

Overview

This component calculates the date of Easter Sunday for a specified Year. Two functions are presented: The first returns a serial number, equivalent to that which you find in Excel, with represents the date of Easter Sunday. The second converts this value into a human readable form (a string!).

Many other important dates (holidays!) can also be calculated from this function, for example:

Septuagesima Sunday = easterSunday(...) -63
Sexagesima Sunday = easterSunday(...) -56
Shrove Sunday = easterSunday(...) -49
Shrove Tuesday = easterSunday(...) -47
Ash Wednesday = easterSunday(...) -46
Mothers Day (UK only)= easterSunday(...) -21
Passion Sunday = easterSunday(...) -14
Palm Sunday = easterSunday(...) -7
Holy or Maundy Thursday = easterSunday(...) -3
Good Friday = easterSunday(...) -2
Rogation Sunday = easterSunday(...) +35
Ascension Day = easterSunday(...) +39
Pentecost or Whitsunday = easterSunday(...) +49
Whitmundy = easterSunday(...) +50
Trinity Sunday = easterSunday(...) +56
Corpus Christi = easterSunday(...) +60 (or easterSunday(...)+63 Catholic Church in the United States)

Example 1

To calculate the date of Good Friday for the next 10 years

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

int main()
{
  for(int year=2004; year<=2014; year++)
  {
    int ndate=easterSunday(year) - 2;
    int d,m,y;
    dateYMD(ndate, y, m, d);
    printf("\n In year %d, Good Friday is on %d/%d", y, d, m);
  }
  return 0;
}

Output:

In year 2004, Good Friday is on 9/4
In year 2005, Good Friday is on 25/3
In year 2006, Good Friday is on 14/4
In year 2007, Good Friday is on 6/4
In year 2008, Good Friday is on 21/3
In year 2009, Good Friday is on 10/4
In year 2010, Good Friday is on 2/4
In year 2011, Good Friday is on 22/4
In year 2012, Good Friday is on 6/4
In year 2013, Good Friday is on 29/3
In year 2014, Good Friday is on 18/4

FUNCTION

easterSunday

Calculates the date of Easter Sunday in the specified Year, returning the serial Julian date (see date).

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References

Tondering, C. 2003. www.tondering.dk/claus/cal/node3.html

Parameters

year

the year to compute easter for

Returns

the serial Julian date (see date)

Author

Will Bateman (Oct 2004)

Interactive Calculator

year

Result –

FUNCTION

easterSunday_str

Returns the date of Easter in a string format with day followed by month for the year specified.

Example 1

int main(void)
{
  for(int year=2004; year<=2014; year++)
  {
    printf("\n%s",Units::Date::easterSunday_str(year).c_str());
  }
}

Parameters

year

the year to compute easter for

Returns

a string containing the date

Interactive Calculator

year

Result –