CFLib.org – Common Function Library Project

Description:
Returns the date for Easter in a given year. If no year is specified, defaults to the current year.

Return Values:
Returns a date object.

Example:

<CFOUTPUT>
Easter falls on #DateFormat(GetEaster(), 'dddd mmmm dd, yyyy')# this year.
</CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns the date for Easter in a given year.
 * Minor edits by Rob Brooks-Bilson (rbils@amkor.com).
 * 
 * @param TheYear      The year to get Easter for. 
 * @return Returns a date object. 
 * @author Ken McCafferty (mccjdk@yahoo.com) 
 * @version 1, September 4, 2001 
 */
function GetEaster() {
  Var TheYear=iif(arraylen(arguments) gt 0,"arguments[1]", "Year(Now())");       
  Var century = Int(TheYear/100);
  Var G = TheYear MOD 19;
  Var K = Int((century - 17)/25);
  Var I = (century - Int(century/4) - Int((century - K)/3) + 19*G + 15) MOD 30;
  Var H = I - Int((I/28))*(1 - Int((I/28))*Int((29/(I + 1)))*Int(((21 - G)/11)));
  Var J = (TheYear + Int(TheYear/4) + H + 2 - century + Int(century/4)) MOD 7;
  Var L = H - J;
  Var EasterMonth = 3 + Int((L + 40)/44);
  Var EasterDay = L + 28 - 31*Int((EasterMonth/4));
  return CreateDate(TheYear,EasterMonth,EasterDay);
}