Created
December 13, 2011 13:59
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function GetEasterDateByYear(pi_year : Integer) : TDateTime; | |
var | |
Y,G,C,X,Z,D,E,N,P,J,M : Integer; | |
begin | |
{Algorithme valable pour les dates comprises entre 1583 et 4099} | |
Y := pi_year; | |
G := (Y mod 19) + 1; | |
C := Trunc((Y/100)) + 1; | |
X := Trunc(3 * C / 4) - 12; | |
Z := Trunc(((8 * C) + 5) / 25) - 5; | |
D := Trunc(((5 * Y) / 4) - X - 10); | |
E := ((11 * G)+ 20 + Z - X) mod 30; | |
if ((E = 25) and (G > 11)) or (E = 24) then | |
E := E + 1; | |
N := 44 - E; | |
if N < 21 then | |
N := N + 30; | |
P := N + 7 - ((D + N) mod 7); | |
if P > 31 then | |
J := P - 31 | |
else | |
J := P; | |
if J = P then | |
M := 3 | |
else | |
M := 4; | |
Result := EncodeDate(pi_year, M, J); | |
end; |
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