Enhancement

- Implemented Record::get_date to eliminated the need to obtain a date
  as a string, then convert to time_t, then instantiate a Date.

src/TDB2.cpp

@@ -891,7 +891,7 @@ int TDB::gc ()
     else if (s == Task::waiting)
     {
       // Wake up tasks that need to be woken.
-      Date wait_date (atoi (task->get ("wait").c_str ()));
+      Date wait_date (task->get_date ("wait"));
       if (now > wait_date)
       {
         task->setStatus (Task::pending);