* The returned tv_nsec is always positive and less than 1e9.
*
* (The value represented is tv_sec + tv_nsec/1e9 seconds - this is a little
- * counterintuitive when tv_sec is positive. E.g., -1.5 seconds is represented
- * as {-2, 500000000).)
+ * counterintuitive when tv_sec is negative. E.g., -1.5 seconds is represented
+ * as {-2, 500000000). Negative time_t values are not guaranteed to be supported
+ * anyway, so it's probably best to stay away from them.)
*
* @param ts1
* @param ts2