Вычисление даты Пасхи

function TtheCalendar.CalcEaster: string;
var
  B, D, E, Q: Integer;

  GF: string;
begin

  B := 225 - 11 * (Year mod 19);
  D := ((B - 21) mod 30) + 21;
  if D > 48 then
    Dec(D);
  E := (Year + (Year div 4) + D + 1) mod 7;
  Q := D + 7 - E;
  if Q < 32 then
  begin
    if ShortDateFormat[1] = 'd' then
      Result := IntToStr(Q) + '/3/' + IntToStr(Year)

    else
      Result := '3/' + IntToStr(Q) + '/' + IntToStr(Year);
  end
  else
  begin
    if ShortDateFormat[1] = 'd' then
      Result := IntToStr(Q - 31) + '/4/' + IntToStr(Year)

    else
      Result := '4/' + IntToStr(Q - 31) + '/' + IntToStr(Year);
  end;
  {вычисление страстной пятницы}
  if Q < 32 then
  begin
    if ShortDateFormat[1] = 'd' then
      GF := IntToStr(Q - 2) + '/3/' + IntToStr(Year)
    else
      GF := '3/' + IntToStr(Q - 2) + '/' + IntToStr(Year);
  end
  else
  begin
    if ShortDateFormat[1] = 'd' then
      GF := IntToStr(Q - 31 - 2) + '/4/' + IntToStr(Year)

    else
      GF := '4/' + IntToStr(Q - 31 - 2) + '/' + IntToStr(Year);
  end;

end;