- * one place, change it in the other. Better yet, put it in a library.)
- * \param t1start date one start
- * \param t1end date one end
- * \param t2start date one start
- * \param t2end date two end
- * \returns nonzero if they do.
+ * one place, change it in the other. We should seriously consider moving
+ * this function upstream into libical.)
+ *
+ * Returns nonzero if they do overlap.