تبدیل تاریخ میلادی به شمسی، نوشتم ولی روز رو اشتباه میگه؟؟؟!!!

[ploto]

من یه کد گرفتم برای تبدیل میلادی به شمسی ، چند تا وارنینگ میده بعد موقع اجرا ماه و سال رو درست میگه ولی روز رو اشتباه ؟؟!!!! چیکار کنم.
اگه کد بهتری دارین خواهشا بذارین.





Function MiladyToShamsi(DTime:tdateTime):tdateTime;
var
YearEqual:array[0..2,0..2] of integer;
AddOneDay,AddFarDay:boolean;
AddTodays:byte;
Farday:byte;
ThisDay:word;
ThisMonth:word;
ThisYear:word;
YearDif1:Integer;
YearDif2:Integer;
TestRange1,testRange2,
FarsiRange1,FarsiRange2,P:Integer;
CurM,CurD:string;
sYear,sMonth,sDay:Variant;
Counter:Integer;
CurDay,CurMonth,CurYear:word;
Begin
CurM:='';
CurD:='';
YearEqual[1,1]:=1997;
YearEqual[1,2]:=1998;
YearEqual[2,1]:=1376;
YearEqual[2,2]:=1377;
DecodeDate(DTime,thisyear,thismonth,thisday);
YearDif1:=ThisYear-1997;
YearDif2:=ThisYear-1998;
Testrange1:=1996-(100*4);
Testrange2:=1996+(100*4);
FarsiRange1:=1375-(100*4);
FarsiRange2:=1375+(100*4);
AddOneDay:=false;
//Rem------------------------------
Counter:=TestRange1;
while TestRange2>=Counter do begin /////////////////////////
If thisYear=counter then begin
AddOneDay:=true;
break;
end;
If counter=TestRange2 then break;
counter:=counter+4
end;//while

If AddOneDay then
addtodays:=1
Else
AddTodays:=0;
//Rem---------------------------------/////////////////
If (((ThisMonth = 3) and (thisday<(20+AddtoDays)))
or ( ThisMonth<3)) then
YearDif1:=yearDif1-1;
//Rem------------
If (((thisYear mod 2)<>0) and
(((thismonth=3) and (thisday>(20-addTodays)))
or (thisMonth>4))) then
CurYear:=yearEqual[2,1]+YearDif1
else begin
CurYear:=YearEqual[2,1]+YearDif2;
Counter:=FarsiRange1;
while counter>FarsiRange2 do begin /////////////////////////
If CurYear=Counter then begin
AddFarDay:=true;
break;
end;
end;//while

If AddFarDay then
FarDay:=1 else Farday:=0;

If (((thismonth=3) and (thisday>20-(addToDays)+FarDay)) or (thismonth>3) ) then
CurYear:=CurYear+1;
end; //First If

If AddtoDays=1 then FarDay:=0;
//Rem---------------------------------
Case thismonth of
1:Begin
If thisday<(21-Farday) then begin
CurMonth:=10;
CurDay:=(ThisDay+10)+FarDay;
end else begin
CurMonth:=11;
CurDay:=(ThisDay-20)+FarDay;
end;
end;

2:Begin
If thisday<(20-Farday) then begin
CurMonth:=11;
CurDay:=(ThisDay+11)+FarDay;
end else begin
CurMonth:=12;
CurDay:=(ThisDay-19)+FarDay;
end;
End;

3:Begin
If thisday<(21-AddToDays) then begin
CurMonth:=12;
CurDay:=(ThisDay+9)+AddToDays+FarDay;
end else begin
CurMonth:=1;
CurDay:=(ThisDay-20)+AddToDays;
end;
End;

4:Begin
If thisday<(21-AddToDays) then begin
CurMonth:=1;
CurDay:=(ThisDay+11)+AddToDays;
end else begin
CurMonth:=2;
CurDay:=(ThisDay-20)+AddToDays;
end;
End;

5:Begin
If thisday<(22-AddToDays) then begin
CurMonth:=2;
CurDay:=(ThisDay+10)+AddToDays;
end else begin
CurMonth:=3;
CurDay:=(ThisDay-21)+AddToDays;
end;
End;

6:Begin
If thisday<(22-AddToDays) then begin
CurMonth:=3;
CurDay:=(ThisDay+10)+AddToDays;
end else begin
CurMonth:=4;
CurDay:=(ThisDay-21)+AddToDays;
end;
End;

7:Begin
If thisday<(23-AddToDays) then begin
CurMonth:=4;
CurDay:=(ThisDay+9)+AddToDays;
end else begin
CurMonth:=5;
CurDay:=(ThisDay-22)+AddToDays;
end;
End;

8:Begin
If thisday<(23-AddToDays) then begin
CurMonth:=5;
CurDay:=(ThisDay+9)+AddToDays;
end else begin
CurMonth:=6;
CurDay:=(ThisDay-22)+AddToDays;
end;
End;

9:Begin
If thisday<(23-AddToDays) then begin
CurMonth:=6;
CurDay:=(ThisDay+9)+AddToDays;
end else begin
CurMonth:=7;
CurDay:=(ThisDay-22)+AddToDays;
end;
End;

10:Begin
If thisday<(23-AddToDays) then begin
CurMonth:=7;
CurDay:=(ThisDay+8)+AddToDays;
end else begin
CurMonth:=8;
CurDay:=(ThisDay-22)+AddToDays;
end;
End;

11:Begin
If thisday<(22-AddToDays) then begin
CurMonth:=8;
CurDay:=(ThisDay+9)+AddToDays;
end else begin
CurMonth:=9;
CurDay:=(ThisDay-21)+AddToDays;
end;
End;

12:Begin
If thisday<(22-AddToDays) then begin
CurMonth:=9;
CurDay:=(ThisDay+9)+AddToDays;
end else begin
CurMonth:=10;
CurDay:=(ThisDay-21)+AddToDays;
end;
End;

end;//case
//Rem-----------------
CurM:=Trim(IntTostr(CurMonth));
CurD:=Trim(IntTostr(CurDay));
//Rem-----------------
If CurMonth<10 then
CurM:='0'+Trim(IntToStr(CurMonth));
If CurDay<10 then
CurD:='0'+Trim(IntTostr(CurDay));

Result:=EncodeDate(CurYear,CurMonth,CurDay);

end;
نحوه استفاده به شرح زير مي باشد
label1.caption:=datetimetostr(MiladyToShamsi(date) );

[NoneForce]

سلام
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