Ok it's work fine. Thanks for plug rex time away suggestions. Combine by browser function such as "suspend on" and "resume on" and webStorage plug, my problem is resolved.
code for timer 95 at 0 :
Global number GameTimer = 95;
(browser | on suspend) then (TimeAway | start timer "timer")
(browser | on resumed) then (System | set GameTimer to GameTimer-TimeAway.ElapsedTimer("timer")
TimeAway | removeTimer "timer")
(blank) then (System | set GameTimer to GameTimer - dt)
(System | every 1.0 second) then (Text | setText to str(int(TimerGame)))