Would guess that as well. Very common error, which comes in many fashions and which can be made in practically any language. I'm mostly working in Java, where it's the same thing with System.currentTimeMillis() used instead of System.nanoTime() to measure and/or enforce timespans (because "you know, nanoseconds are so unwieldy, and milliseconds are so nice on the eyes, and I only needed millisecond precision...and anyway, who on earth would change the clock while our software is running...").