When was Easter Sunday in 1953?

Did you ever try to implement a calendar? If so, you already know that this is one of the most intricate tasks a programmer can come upon (;-))). More on the background of that can be found, for example, in Wikipedia.

To make things short, here's the Delphi code of the formula developed by Carl Gauss, including the correction of Lichtenberg (the code snippet is taken from the calendar component of the SDL Component Suite):

procedure CalcEasterSunday
     (Year: integer; var Day, Mon: integer);
(****************************************************
  ENTRY: Year ....... year to be calculated
  EXIT:  Day, Mon ... day and month of Easter Sunday
 ****************************************************)

var
  kx, mk, sk  : integer;
  ax          : integer;
  dam         : integer;
  rda         : integer;
  sz          : integer;
  og,oe       : integer;

begin
kx := Year div 100;
mk := 15 + (3*kx + 3) div 4 - (8*kx + 13) div 25;
sk := 2 - (3*kx + 3) div 4;
ax := Year mod 19;
dam := (19*ax + mk) mod 30;
rda := (dam + ax div 11) div 29;
og := 21 + dam - rda;
sz := 7 - (Year + Year div 4 + sk) mod 7;
oe := 7 - (og - sz) mod 7;
Mon := 3;
Day := og + oe;
if Day > 31 then
  begin
  Mon := 4;
  Day := Day-31;
  end;
end;

The date is calculated for the Gregorian calendar (which is the most widely used one in the Western hemisphere). As you can easily calculate, Easter Sunday in 1953 was the 5th of April....