Martin Luther King Jr. Day - Third Monday in January

Here is a simple Delphi function that takes a year as its input and returns the date for Martin Luther King Jr. Day (third Monday in January). For additional Delphi code to return key dates, see Delphi Code To Return Holidays, Observances, Celebrations, Historical, and Other Key Dates.

function MartinLutherKingJrDay(TargetYear: Integer): TDate;
var
   JanuaryMondayCount: Integer;
   TargetDate: TDate;
begin
     MartinLutherKingJrDay := 0;

     JanuaryMondayCount := 0;

     TargetDate := 0;

     TargetDate := StrToDate('1/1/'+IntToStr(TargetYear));
     JanuaryMondayCount := 0;
     If DayOfTheWeek(TargetDate) = 1 then JanuaryMondayCount := 1; //1 = Monday
     repeat
           TargetDate := TargetDate + 1;
           If DayOfTheWeek(TargetDate) = 1 then JanuaryMondayCount := JanuaryMondayCount + 1;
     until JanuaryMondayCount = 3;

     MartinLutherKingJrDay := TargetDate;
end;

The procedure below uses the function shown above to retrieve Martin Luther King Jr. Day for a range of years. The FormatDateTime function can be used to format the date in any way desired.

procedure TForm1.Button1Click(Sender: TObject);
var
   Year: Integer;
begin
     For Year := 2000 to 2100 do
        begin
             Memo1.Lines.Add(FormatDateTime('dddd, mmmm d, yyyy', MartinLutherKingJrDay(Year)));
        end;
end;