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| function GetDateDifference(const Date1, Date2: TDate): string;
type
PDayTable = ^TDayTable;
TDayTable = array[1..12] of Word;
const
MonthDays: array [Boolean] of TDayTable = ((31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
(31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31));
var
D1, M1, Y1: Word;
D2, M2, Y2: Word;
D3, M3, Y3: Word;
begin
if Date1 < Date2 then
begin
DecodeDate(Date1, Y1, M1, D1);
DecodeDate(Date2, Y2, M2, D2);
end
else begin
DecodeDate(Date1, Y1, M1, D1);
DecodeDate(Date2, Y2, M2, D2);
end;
D3 := 0; M3 := 0; Y3 := 0;
if Y1 <> Y2 then
begin
Y3 := Y2 - Y1;
if M1 > M2 then Y3 := Y3 - 1;
end;
if M1 <> M2 then
begin
if M1 > M2 then
begin
M3 := (StrToInt('1' + IntToStr(M2))) - M1 + 1;
if D1 < D2 then M3 := M3 + 1;
end
else M3 := M2 - M1;
end;
if D1 <> D2 then
begin
if D1 < D2 then D3 := D2 - D1
else D3 := (MonthDays[(M3 = 2) and (Y3 mod 4 = 0) and ((Y3 mod 100 <> 0) or (Y3 mod 400 = 0)), M3]) - D1 + 1;
end;
Result := Format('%d.%d.%d', [D3, M3, Y3]);
end; |
elundril
