diff --git a/Code/Mantid/Framework/Kernel/src/TimeSeriesProperty.cpp b/Code/Mantid/Framework/Kernel/src/TimeSeriesProperty.cpp
index 846f4ebdbc6b..96c0bbfb9f00 100644
--- a/Code/Mantid/Framework/Kernel/src/TimeSeriesProperty.cpp
+++ b/Code/Mantid/Framework/Kernel/src/TimeSeriesProperty.cpp
@@ -484,26 +484,14 @@ namespace Mantid
 
           if (isGood)
           {
-            //Start of a good section
-            if (centre)
-              start = t - tol;
-            else
-              start = t;
+            // Start of a good section. Subtract tolerance from the time if boundaries are centred.
+            start = centre ? t - tol : t;
           }
           else
           {
-            //End of the good section
-            if (numgood == 1 || centre )
-            {
-              // If there was only one point with the value, or values represent bin centres,
-              // use the last good time, + the tolerance, as the end time
-              stop = lastTime + tol;
-            }
-            else
-            {
-              // At least 2 good values for left boundary aligned logs. Save the end time.
-              stop = t;
-            }
+            // End of the good section. Add tolerance to the LAST GOOD time if boundaries are centred.
+            // Otherwise, use the first 'bad' time.
+            stop = centre ? lastTime + tol : t;
             split.push_back( SplittingInterval(start, stop, 0) );
             //Reset the number of good ones, for next time
             numgood = 0;
diff --git a/Code/Mantid/Framework/Kernel/test/TimeSeriesPropertyTest.h b/Code/Mantid/Framework/Kernel/test/TimeSeriesPropertyTest.h
index 449fdeaabe40..5fa39eea1651 100644
--- a/Code/Mantid/Framework/Kernel/test/TimeSeriesPropertyTest.h
+++ b/Code/Mantid/Framework/Kernel/test/TimeSeriesPropertyTest.h
@@ -373,7 +373,7 @@ class TimeSeriesPropertyTest : public CxxTest::TestSuite
     s = splitter[0];
     t = DateAndTime("2007-11-30T16:17:10");
     TS_ASSERT_DELTA( s.start(), t, 1e-3);
-    t = DateAndTime("2007-11-30T16:17:11");
+    t = DateAndTime("2007-11-30T16:17:20");
     TS_ASSERT_DELTA( s.stop(), t, 1e-3);
 
     s = splitter[1];