Timer start time and end time calculation gives 4 secs extra

Question

i am working on WP8 , i am using timer where i am calulating the total time.

This is how i am doing it:

timer = new DispatcherTimer();
 timer.Interval =          


        

Answer 1

So you are counting ticks with this timer and expecting after 60 ticks of 1s, exactly 1 minute will have passed.

It doesn't work like that. Other stuff is happening in the application, and .NET never assures it will be exactly one second between ticks.

If you want accuracy, use System.Diagnostics.Stopwatch which gives a very accurate elapsed time based on the system clock.