Memorial Day - Last Monday in May

Here is a simple Delphi function that takes a year as its input and returns the date for Memorial Day (last Monday in May), a day that is meant to honor and mourn all U.S. military personnel who died while serving in the United States Armed Forces. For additional Delphi code to return key dates, see Delphi Code To Return Holidays, Observances, Celebrations, Historical, and Other Key Dates.

function MemorialDay(TargetYear: Integer): TDate;
var
   MondayCount: Integer;
   TargetDate: TDate;
begin
     MemorialDay := 0;

     MondayCount := 0;

     TargetDate := 0;

     TargetDate := StrToDate('5/31/'+IntToStr(TargetYear));
     MondayCount := 0;
     If DayOfTheWeek(TargetDate) = 1 then MondayCount := 1; //1 = Monday
     If MondayCount = 0 then
        begin
             repeat
                   TargetDate := TargetDate - 1;
                   If DayOfTheWeek(TargetDate) = 1 then MondayCount := MondayCount + 1;
             until MondayCount = 1;
        end;

     MemorialDay := TargetDate;
end;

The procedure below uses the function shown above to retrieve Labor 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', MemorialDay(Year)));
        end;
end;