Contributor: SWAG SUPPORT TEAM
Unit Julian;
{DEMO Routines
/begin
/ ClrScr;
/ GetDate(Year,Month,Day,Dow);
/ WriteLn('Year : ',Year);
/ WriteLn('Month : ',Month);
/ WriteLn('Day : ',Day);
/ WriteLn('doW : ',Dow);
/ WriteLn(MachineDate);
/ JulianDate := DatetoJulian(MachineDate);
/ WriteLn('Julian Date = ',JulianDate);
/ WriteLn('Jul to Date = ',JuliantoDate(JulianDate));
/ WriteLn('Day of Week = ',DayofWeek(JulianDate));
/ WriteLn('Time = ',MachineTime(4));
/end.}
Interface
Uses Crt, Dos;
Type
Str3 = String[3];
Str8 = String[8];
Str9 = String[9];
Str11 = String[11];
Var
Hour,Minute,Second,S100,
Year,Month,Day,Dow : Word;
Syear,Smonth,Sday,Sdow : String;
JulianDate : Integer;
Function MachineTime(Len : Byte) : Str11;
Function MachineDate : Str8;
Function DateFactor(MonthNum, DayNum, YearNum : Real) : Real;
Function DatetoJulian(DateLine : Str8) : Integer;
Function JuliantoDate(DateInt : Integer): Str11;
Function JuliantoStr8(DateInt : Integer): Str8;
Function DayofWeek(Jdate : Integer) : Str3;
Procedure DateDiff(Date1,Date2 : Integer; Var Date_Difference : Str9);
Implementation
Function MachineTime(Len : Byte) : Str11;
Var
I : Byte;
TempStr : String;
TimeStr : Array[1..4] of String;
begin
TempStr := ''; FillChar(TimeStr,Sizeof(TimeStr),0);
GetTime(Hour,Minute,Second,S100);
Str(Hour,TimeStr[1]);
Str(Minute,TimeStr[2]);
Str(Second,TimeStr[3]);
Str(S100,TimeStr[4]);
TempStr := TimeStr[1];
For I := 2 to Len Do TempStr := TempStr + ':' + TimeStr[I];
MachineTime := TempStr;
end;
Function MachineDate : Str8;
begin
GetDate(Year,Month,Day,Dow);
Str(Year,Syear);
Str(Month,Smonth);
if Month < 10 then Smonth := '0' + Smonth;
Str(Day,Sday);
if Day < 10 then Sday := '0' + Sday;
MachineDate := smonth + sday + syear;
end;
Function DateFactor(MonthNum, DayNum, YearNum : Real) : Real;
Var
Factor : Real;
begin
Factor := (365 * YearNum)
+ DayNum
+ (31 * (MonthNum-1));
if MonthNum < 3
then Factor := Factor
+ Int((YearNum-1) / 4)
- Int(0.75 * (Int((YearNum-1) / 100) + 1))
else Factor := Factor
- Int(0.4 * MonthNum + 2.3)
+ Int(YearNum / 4)
- Int(0.75 * (Int(YearNum / 100) + 1));
DateFactor := Factor;
end;
Function DatetoJulian(DateLine : Str8) : Integer;
Var
Factor, MonthNum, DayNum, YearNum : Real;
Ti : Integer;
begin
if Length(DateLine) = 7
then DateLine := '0'+DateLine;
MonthNum := 0.0;
For Ti := 1 to 2 Do
MonthNum := (10 * MonthNum)
+ (ord(DateLine[Ti])-ord('0'));
DayNum := 0.0;
For Ti := 3 to 4 Do
DayNum := (10 * DayNum)
+ (ord(DateLine[Ti])-ord('0'));
YearNum := 0.0;
For Ti := 5 to 8 Do
YearNum := (10 * YearNum)
+ (ord(DateLine[Ti])-ord('0'));
Factor := DateFactor(MonthNum, DayNum, YearNum);
DatetoJulian :=
Trunc((Factor - 679351.0) - 32767.0);
end;
Function JuliantoDate(DateInt : Integer): Str11;
Var
holdstr : String[2];
anystr : String[11];
StrMonth : String[3];
strDay : String[2];
stryear : String[4];
test,
error,
Year,
Dummy,
I : Integer;
Save,Temp : Real;
JuliantoanyString : Str11;
begin
holdstr := '';
JuliantoanyString := '00000000000';
Temp := Int(DateInt) + 32767 + 679351.0;
Save := Temp;
Dummy := Trunc(Temp/365.5);
While Save >= DateFactor(1.0,1.0,Dummy+0.0)
Do Dummy := Succ(Dummy);
Dummy := Pred(Dummy);
Year := Dummy;
(* Determine number of Days into current year *)
Temp := 1.0 + Save - DateFactor(1.0,1.0,Year+0.0);
(* Put the Year into the output String *)
For I := 8 downto 5 Do
begin
JuliantoanyString[I]
:= Char((Dummy mod 10)+ord('0'));
Dummy := Dummy div 10;
end;
Dummy := 1 + Trunc(Temp/31.5);
While Save >= DateFactor(Dummy+0.0,1.0,Year+0.0)
Do Dummy := Succ(Dummy);
Dummy := Pred(Dummy);
Temp := 1.0 + Save - DateFactor(Dummy+0.0,1.0,Year+0.0);
For I := 2 Downto 1 Do
begin
JuliantoanyString[I]
:= Char((Dummy mod 10)+ord('0'));
Dummy := Dummy div 10;
end;
Dummy := Trunc(Temp);
For I := 4 Downto 3 Do
begin
JuliantoanyString[I]
:= Char((Dummy mod 10)+ord('0'));
Dummy := Dummy div 10;
end;
holdstr := copy(juliantoanyString,1,2);
val(holdstr,test,error);
Case test of
1 : StrMonth := 'Jan';
2 : StrMonth := 'Feb';
3 : StrMonth := 'Mar';
4 : StrMonth := 'Apr';
5 : StrMonth := 'May';
6 : StrMonth := 'Jun';
7 : StrMonth := 'Jul';
8 : StrMonth := 'Aug';
9 : StrMonth := 'Sep';
10 : StrMonth := 'Oct';
11 : StrMonth := 'Nov';
12 : StrMonth := 'Dec';
end;
stryear := copy(juliantoanyString,5,4);
strDay := copy(juliantoanyString,3,2);
anystr := StrDay + '-' + StrMonth + '-' +stryear;
JuliantoDate := anystr;
end;
Function JuliantoStr8(DateInt : Integer): Str8;
Var
holdstr : String[2]; anystr : String[8]; StrMonth : String[2];
strDay : String[2]; stryear : String[4]; Save, Temp : Real;
test, error, Year, Dummy, I : Integer; JuliantoanyString : Str8;
begin
holdstr := ''; JuliantoanyString := '00000000';
Temp := Int(DateInt) + 32767 + 679351.0;
Save := Temp; Dummy := Trunc(Temp/365.5);
While Save >= DateFactor(1.0,1.0,Dummy+0.0) Do Dummy := Succ(Dummy);
Dummy := Pred(Dummy); Year := Dummy;
Temp := 1.0 + Save - DateFactor(1.0,1.0,Year+0.0);
For I := 8 downto 5 Do
begin
JuliantoanyString[I] := Char((Dummy mod 10)+ord('0'));
Dummy := Dummy div 10;
end;
Dummy := 1 + Trunc(Temp/31.5);
While Save >= DateFactor(Dummy+0.0,1.0,Year+0.0) Do Dummy := Succ(Dummy);
Dummy := Pred(Dummy);
Temp := 1.0 + Save - DateFactor(Dummy+0.0,1.0,Year+0.0);
For I := 2 Downto 1 Do
begin
JuliantoanyString[I] := Char((Dummy mod 10)+ord('0'));
Dummy := Dummy div 10;
end;
Dummy := Trunc(Temp);
For I := 4 Downto 3 Do
begin
JuliantoanyString[I] := Char((Dummy mod 10)+ord('0'));
Dummy := Dummy div 10;
end;
holdstr := copy(juliantoanyString,1,2); val(holdstr,test,error);
Case test of
1 : StrMonth := '01'; 2 : StrMonth := '02'; 3 : StrMonth := '03';
4 : StrMonth := '04'; 5 : StrMonth := '05'; 6 : StrMonth := '06';
7 : StrMonth := '07'; 8 : StrMonth := '08'; 9 : StrMonth := '09';
10 : StrMonth := '10'; 11 : StrMonth := '11'; 12 : StrMonth := '12';
end;
StrYear := copy(juliantoanyString,5,4);
StrDay := copy(juliantoanyString,3,2);
AnyStr := StrMonth + StrDay + StrYear; JuliantoStr8 := AnyStr;
end;
Function DayofWeek(Jdate : Integer) : Str3;
begin
Case jdate MOD 7 of
0:DayofWeek:='Sun'; 1:DayofWeek:='Mon'; 2:DayofWeek := 'Tue';
3:DayofWeek:='Wed'; 4:DayofWeek:='Thu'; 5:DayofWeek := 'Fri';
6:DayofWeek:='Sat';
end;
end;
Procedure DateDiff(Date1,Date2 : Integer;
Var Date_Difference : Str9);
Var
Temp,Rdate1,Rdate2,Diff1 : Real; Diff : Integer;
Return : String[9]; Hold : String[3];
begin
Rdate2 := Date2 + 32767.5; Rdate1 := Date1 + 32767.5;
Diff1 := Rdate1 - Rdate2; Temp := Diff1;
if Diff1 < 32 then (* determine number of Days *)
begin
Diff := Round(Diff1); Str(Diff,Hold);
Return := Hold + ' ' + 'Day';
if Diff > 1 then Return := Return + 's ';
end;
if ((Diff1 > 31) and (Diff1 < 366)) then
begin
Diff1 := Diff1 / 30; Diff := Round(Diff1); Str(Diff,Hold);
Return := Hold + ' ' + 'Month';
if Diff > 1 then Return := Return + 's';
end;
if Diff1 > 365 then
begin
Diff1 := Diff1 / 365; Diff := Round(Diff1); Str(Diff,Hold);
Return := Hold;
end;
Date_Difference := Return; Diff := Round(Diff1);
end;
end.