static long timeJumpDetector_lastTimeJump; // in sys time

static long timeJumpDetector_lastTimeJumpLength;

sbool timeJumpDetector_verbose;

static L timeJumpDetector_onTimeJump = synchroList();

static int timeJumpDetector_minJump = 5000;

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) <= timeJumpDetector_minJump && /*isWindows() &&*/ sysNow-lastSysNow >= 10000)

        d = sysNow-lastSysNow-10000;

      if (abs(d) > timeJumpDetector_minJump) {

        diff = now()-sysNow();

        timeJumpDetector_lastTimeJump = sysNow();

        timeJumpDetector_lastTimeJumpLength = d;

        printAndProgramLog(ymd_hms() + ": Time jump occurred! (" + formatDouble(toSeconds(d), 1) + " seconds)");

        if (nempty(timeJumpDetector_onTimeJump)) thread {

          pcallFAll(concurrentlyIterateList(timeJumpDetector_onTimeJump));

        }

      }

      diff = newDiff;

      lastSysNow = sysNow;

    }

  });

}