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static long timeJumpDetector_lastTimeJump; // in sys time
static long timeJumpDetector_lastTimeJumpLength;
sbool timeJumpDetector_verbose;

static void timeJumpDetector() {
  doEvery(1000, new Runnable {
    long diff = now()-sysNow();
    long lastSysNow = sysNow();
    
    public void run() {
      long sysNow = sysNow();
      long newDiff = now()-sysNow;
      long d = newDiff-diff;
      if (timeJumpDetector_verbose)
        print("timeJumpDetector: sysNow=" + sysNow + ", diff=" + newDiff);
      if (abs(d) > 100 || isWindows() && sysNow-lastSysNow >= 10000) {
        timeJumpDetector_lastTimeJump = sysNow();
        timeJumpDetector_lastTimeJumpLength = d;
        print("Time jump occurred! (" + formatDouble(toSeconds(d), 1) + " seconds)");
      }
      diff = newDiff;
      lastSysNow = sysNow;
    }
  });
}