+/**
+ * \relates SGTime
+ * Given an optional offset from current time calculate the current
+ * modified julian date.
+ * @param warp number of seconds to offset from current time (0 if no offset)
+ * @return current modified Julian date (number of days elapsed
+ * since 1900 jan 0.5), mjd. */
+double sgTimeCurrentMJD( long int warp );
+