diff --git a/src/lib/time/timevalue.hpp b/src/lib/time/timevalue.hpp
index aa08c00ca..4087a9f5f 100644
--- a/src/lib/time/timevalue.hpp
+++ b/src/lib/time/timevalue.hpp
@@ -409,8 +409,14 @@ namespace time {
       Time
       end()  const
         {
-          TimeVar startPoint (*this);
-          return (startPoint + dur_);
+          return TimeVar(*this) += dur_;
+        }
+      
+      bool
+      contains (TimeValue const& tp)  const
+        {
+          return *this <= tp
+              && tp < end();
         }
       
       /** may change start / duration */
diff --git a/tests/lib/time/time-value-test.cpp b/tests/lib/time/time-value-test.cpp
index 27c4c1524..9a5a6fc4c 100644
--- a/tests/lib/time/time-value-test.cpp
+++ b/tests/lib/time/time-value-test.cpp
@@ -75,6 +75,7 @@ namespace test{
           buildDuration (ref);
           buildTimeSpan (ref);
           compareTimeSpan (ref);
+          relateTimeIntervals (ref);
         } 
       
       
@@ -381,6 +382,30 @@ namespace test{
           CHECK (span3y.end()  < span3z.end());
           CHECK (Time(span3)  < Time(span3z));
         }
+      
+      
+      void
+      relateTimeIntervals (TimeValue org)
+        {
+          TimeSpan span1 (org,                FSecs(2));
+          TimeSpan span2 (org+Time(FSecs(1)), FSecs(2));
+          
+          TimeVar probe(org);
+          CHECK ( span1.contains(probe));
+          CHECK (!span2.contains(probe));
+          
+          probe = span2;
+          CHECK ( span1.contains(probe));
+          CHECK ( span2.contains(probe));
+          
+          probe = span1.end();
+          CHECK (!span1.contains(probe));              // Note: end is always exclusive
+          CHECK ( span2.contains(probe));
+          
+          probe = span2.end();
+          CHECK (!span1.contains(probe));
+          CHECK (!span2.contains(probe));
+        }
     };