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Index › Programming Questions & Help › Syntax Questions › millis() rollover
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millis() rollover (Read 369 times)
Zap
millis() rollover
May 27th, 2009, 2:53pm  
Does anyone know what millis() does if it exceeds the maximum value for an integer? I have a program which is to run indefinitely and I use millis() in a timer function. Will I have a problem after 24 or so days?
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st33d
Re: millis() rollover
Reply #1 - May 27th, 2009, 3:15pm  
An int's maximum value is 2147483647

2147483647 / 1000fps = 2147483.647
71582788.233 / 60 sec = 35791.3941
35791.3941 / 60 min = 596.523
596.523 / 24 hrs = 9.942

You have nine days before millis would theoretically stop working.

Or, if you set a counter to count on each frame, you could then approximate the current amount of milliseconds that have passed. At a framerate of 30, you would have 2 years.

Other than that you can use Java's Date object, and subtract the current milliseconds from the timestamp of the program's start. You would need to store this value as a long (int).
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