老森常譚

var
  vTime, vTime1, vTime2: double;
begin
  vTime1 := GetTickCount();
  vTime2 := GetTickCount();
  vTime := (vTime2 - vTime1) / 1000;
  Showmessage(floatToStr(vTime) + 's');
end;

【參考連結】

• delphi怎样求出两时间之间相差多少秒？-CSDN社区