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  4. Find the number of days in actual month
function DaysInMonth: Integer;
var
Year, Month, Day: Word;
begin
DecodeDate(Now, Year, Month, Day);
Result := MonthDays[IsLeapYear(Year), Month];
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(IntToStr(DaysInMonth));
end;