From b50c9553124608a66a34666828a1cb80cc5420c3 Mon Sep 17 00:00:00 2001
From: Anton Vasetenkov <antvaset@gmail.com>
Date: Thu, 4 Jun 2026 07:15:51 +1200
Subject: [PATCH] When calculating duration in years between dates, if both
 dates fall on the last day of February, the expected result is "year (date 2)
 - year (date 1)".

---
 tests/cql/CqlDateTimeOperatorsTest.xml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/cql/CqlDateTimeOperatorsTest.xml b/tests/cql/CqlDateTimeOperatorsTest.xml
index 193a390..1cdf904 100644
--- a/tests/cql/CqlDateTimeOperatorsTest.xml
+++ b/tests/cql/CqlDateTimeOperatorsTest.xml
@@ -821,6 +821,16 @@
 			<expression>years between DateTime(2005, 5) and DateTime(2010, 4)</expression>
 			<output>4</output>
 		</test>
+		<test name="YearsBetweenLeapYears1" version="1.4">
+			<capability code="duration-between"/>
+			<expression>years between @2012-02-29 and @2014-02-28</expression>
+			<output>2</output>
+		</test>
+		<test name="YearsBetweenLeapYears2" version="1.4">
+			<capability code="duration-between"/>
+			<expression>years between @2012-02-29T12:34:56 and @2014-02-28T12:34:56</expression>
+			<output>2</output>
+		</test>
 		<test name="DateTimeDurationBetweenMonth" version="1.4">
 		  	<capability code="duration-between"/>
 			<expression>months between @2014-01-31 and @2014-02-01</expression>