{ 1 h=1*60 m=1*60*60 s=1*60*60*1000
hs=3600000hs}
function
StartCount():string;
{$j+}
const
h:Integer=0;
m:Integer=0;
s:integer=0;
{$j-}
begin
inc(s);
if s>=60 then
begin
Inc(m);
s:=0;
end;
if m>=60 then
begin
Inc(h);
m:=0;
end;
Result:=Format(‘%.2d:%.2d:%.2d‘,[h,m,s]);
end;
procedure TForm1.Timer1Timer(Sender:
TObject);
begin
label1.Caption:= StartCount();
end;
///倒计时
function dec1():string;
{$j+}
const i:Integer=60*5;
{$j-}
begin
Dec(i);
Result:=Format(‘剩余时间:%d‘,[i]);
end;
procedure TForm1.Timer1Timer(Sender: TObject);{$j+}
begin
label1.Caption:=dec1;
end;
var h1: Integer = 0; m1: Integer = 0; s1: Integer = 0;
procedure TForm2.Timer1Timer(Sender: TObject);begin if (h1 <= 0) and (m1 <= 0) and (s1 <= 0) then exit;
Dec(s1); if s1 <= 0 then begin if (m1 > 0) or (h1 > 0) then begin Dec(m1); s1 := 60; end; end; if m1 < 0 then begin if h1 > 0 then begin Dec(h1); m1 := 60; end; end;
Label1.Caption := Format(‘%.2d:%.2d:%.2d‘, [h1, m1, s1]);end;原文：http://www.cnblogs.com/xe2011/p/3875874.html