diff --git a/tests/cql/CqlIntervalOperatorsTest.xml b/tests/cql/CqlIntervalOperatorsTest.xml
index 72356c8..487e639 100644
--- a/tests/cql/CqlIntervalOperatorsTest.xml
+++ b/tests/cql/CqlIntervalOperatorsTest.xml
@@ -1044,6 +1044,26 @@
 			<expression>Interval[DateTime(2012, 1, 5), DateTime(2012, 1, 25)] overlaps Interval[DateTime(2012, 1, 26), DateTime(2012, 1, 28)]</expression>
 			<output>false</output>
 		</test>
+		<test name="DateTimeOverlapsPrecisionLeftPossiblyStartsDuringRight">
+			<expression>Interval[DateTime(2012, 2, 25), DateTime(2012, 3, 26)] overlaps Interval[DateTime(2012, 1, 10), DateTime(2012, 2)]</expression>
+			<output>null</output>
+		</test>
+		<test name="DateTimeOverlapsPrecisioLeftPossiblyEndsDuringRight">
+			<expression>Interval[DateTime(2012, 1, 25), DateTime(2012, 2, 26)] overlaps Interval[DateTime(2012, 2), DateTime(2012, 3, 28)]</expression>
+			<output>null</output>
+		</test>
+		<test name="DateTimeOverlapsPrecisionLeftPossiblyStartsAndEndsDuringRight">
+			<expression>Interval[DateTime(2012, 2), DateTime(2012, 3)] overlaps Interval[DateTime(2011, 1, 10), DateTime(2012)]</expression>
+			<output>null</output>
+		</test>
+		<test name="DateTimeOverlapsPrecisionRightPossiblyStartsDuringLeftButEndsDuringLeft">
+			<expression>Interval[DateTime(2012), DateTime(2013, 3)] overlaps Interval[DateTime(2012, 2), DateTime(2013, 2)]</expression>
+			<output>true</output>
+		</test>
+		<test name="DateTimeOverlapsPrecisionRightStartsDuringLeftAndPossiblyEndsDuringLeft">
+			<expression>Interval[DateTime(2012, 2), DateTime(2013)] overlaps Interval[DateTime(2012, 3), DateTime(2013, 2)]</expression>
+			<output>true</output>
+		</test>
 		<test name="TimeOverlapsTrue">
 			<expression>Interval[@T10:00:00.000, @T19:59:59.999] overlaps Interval[@T12:00:00.000, @T21:59:59.999]</expression>
 			<output>true</output>