diff --git a/.idea/runConfigurations/_template__of_JUnit.xml b/.idea/runConfigurations/_template__of_JUnit.xml
index 46e88262..a63745f9 100644
--- a/.idea/runConfigurations/_template__of_JUnit.xml
+++ b/.idea/runConfigurations/_template__of_JUnit.xml
@@ -4,7 +4,7 @@
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="class" />
-    <option name="VM_PARAMETERS" value="-ea --add-opens java.base/jdk.internal.reflect=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED" />
+    <option name="VM_PARAMETERS" value="-ea --add-opens java.base/jdk.internal.reflect=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens java.base/java.time=ALL-UNNAMED" />
     <option name="PARAMETERS" value="" />
     <method v="2">
       <option name="Make" enabled="true" />
diff --git a/handout-files/.idea/runConfigurations/_template__of_JUnit.xml b/handout-files/.idea/runConfigurations/_template__of_JUnit.xml
index 46e88262..a63745f9 100644
--- a/handout-files/.idea/runConfigurations/_template__of_JUnit.xml
+++ b/handout-files/.idea/runConfigurations/_template__of_JUnit.xml
@@ -4,7 +4,7 @@
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="class" />
-    <option name="VM_PARAMETERS" value="-ea --add-opens java.base/jdk.internal.reflect=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED" />
+    <option name="VM_PARAMETERS" value="-ea --add-opens java.base/jdk.internal.reflect=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens java.base/java.time=ALL-UNNAMED" />
     <option name="PARAMETERS" value="" />
     <method v="2">
       <option name="Make" enabled="true" />
diff --git a/handout-files/run-tests.py b/handout-files/run-tests.py
index 0f328d8d..15b58ff9 100755
--- a/handout-files/run-tests.py
+++ b/handout-files/run-tests.py
@@ -26,7 +26,8 @@
     '--add-opens', 'java.base/jdk.internal.reflect=ALL-UNNAMED',
     '--add-opens', 'java.base/java.lang=ALL-UNNAMED',
     '--add-opens', 'java.base/java.util=ALL-UNNAMED',
-    '--add-opens', 'java.base/java.util.concurrent.atomic=ALL-UNNAMED'
+    '--add-opens', 'java.base/java.util.concurrent.atomic=ALL-UNNAMED',
+    '--add-opens', 'java.base/java.time=ALL-UNNAMED',
 )
 
 if platform.system() == 'Windows':