diff --git a/src/main/java/org/olat/admin/user/bulkChange/UserBulkChangeStep01.java b/src/main/java/org/olat/admin/user/bulkChange/UserBulkChangeStep01.java
index 9a297e84112d4ab026ddda911428cc86c3fc52c9..1b94ad2d9abb00b16a0380934a645d98ca9453ca 100644
--- a/src/main/java/org/olat/admin/user/bulkChange/UserBulkChangeStep01.java
+++ b/src/main/java/org/olat/admin/user/bulkChange/UserBulkChangeStep01.java
@@ -20,6 +20,7 @@
 package org.olat.admin.user.bulkChange;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -52,8 +53,6 @@ import org.olat.core.util.Util;
 import org.olat.user.UserManager;
 import org.springframework.beans.factory.annotation.Autowired;
 
-import edu.emory.mathcs.backport.java.util.Collections;
-
 /**
  * Description:<br>
  * first step: select attributes, which should be changed
diff --git a/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamAdminController.java b/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamAdminController.java
index 906d7470b2281257f09f3a745edb0820fd3dfdcc..9e61db4752d223c8fe041df343ce3f775b5abf02 100644
--- a/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamAdminController.java
+++ b/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamAdminController.java
@@ -24,6 +24,8 @@ import static org.olat.core.gui.translator.TranslatorHelper.translateAll;
 import static org.olat.course.nodes.livestream.ui.LiveStreamUIFactory.validateInteger;
 import static org.olat.course.nodes.livestream.ui.LiveStreamUIFactory.validateMandatory;
 
+import java.util.Arrays;
+
 import org.olat.core.gui.UserRequest;
 import org.olat.core.gui.components.form.flexible.FormItem;
 import org.olat.core.gui.components.form.flexible.FormItemContainer;
@@ -40,8 +42,6 @@ import org.olat.course.nodes.livestream.LiveStreamModule;
 import org.olat.course.nodes.livestream.paella.PlayerProfile;
 import org.springframework.beans.factory.annotation.Autowired;
 
-import edu.emory.mathcs.backport.java.util.Arrays;
-
 /**
  * 
  * Initial date: 5 Jun 2019<br>
diff --git a/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamConfigController.java b/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamConfigController.java
index 638740ebdd5876d0e7957ff1403443cef9e22366..41627e160fc4ff15cc033ebf1d1f0f23a23ab8e1 100644
--- a/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamConfigController.java
+++ b/src/main/java/org/olat/course/nodes/livestream/ui/LiveStreamConfigController.java
@@ -23,6 +23,8 @@ import static org.olat.core.gui.components.util.KeyValues.entry;
 import static org.olat.core.gui.translator.TranslatorHelper.translateAll;
 import static org.olat.course.nodes.livestream.ui.LiveStreamUIFactory.validateInteger;
 
+import java.util.Arrays;
+
 import org.olat.core.gui.UserRequest;
 import org.olat.core.gui.components.form.flexible.FormItemContainer;
 import org.olat.core.gui.components.form.flexible.elements.MultipleSelectionElement;
@@ -39,8 +41,6 @@ import org.olat.course.nodes.livestream.paella.PlayerProfile;
 import org.olat.modules.ModuleConfiguration;
 import org.springframework.beans.factory.annotation.Autowired;
 
-import edu.emory.mathcs.backport.java.util.Arrays;
-
 /**
  * 
  * Initial date: 23.05.2019<br>
diff --git a/src/main/java/org/olat/modules/grading/manager/GradingAssignmentDAO.java b/src/main/java/org/olat/modules/grading/manager/GradingAssignmentDAO.java
index 7f569e1049eb4e406160408aa4c6c6db363a9ffe..75be14e7d9f9886f786cbd72be2163b36eaf7cfb 100644
--- a/src/main/java/org/olat/modules/grading/manager/GradingAssignmentDAO.java
+++ b/src/main/java/org/olat/modules/grading/manager/GradingAssignmentDAO.java
@@ -404,7 +404,14 @@ public class GradingAssignmentDAO {
 		return assignments.isEmpty() ? null : assignments.get(0);
 	}
 	
-	public List<GradingAssignment> getGradingAssignmentsToRemind() {
+	/**
+	 * This is not an exact method! check the configuration before send remidners.
+	 * 
+	 * @return A list of grading assignments where the status is assigned or
+	 *   in process, the assignment was done and the configuration defined some
+	 *   reminders date.
+	 */
+	public List<GradingAssignment> getGradingAssignmentsOpenWithPotentialToRemind() {
 		QueryBuilder sb = new QueryBuilder();
 		sb.append("select assignment from gradingassignment as assignment")
 		  .append(" inner join assignment.referenceEntry referenceEntry")
@@ -413,9 +420,9 @@ public class GradingAssignmentDAO {
 		  .append(" and assignment.status ").in(GradingAssignmentStatus.assigned, GradingAssignmentStatus.inProcess)
 		  .append(" and assignment.assignmentDate is not null")
 		  .append(" and (")
-		  .append("   (assignment.reminder1Date is null and assignment.assignmentDate <= cast((current_date - cast(config.firstReminder as integer)) as date))")
+		  .append("   (assignment.reminder1Date is null and assignment.assignmentDate <= current_date)")
 		  .append("   or")
-		  .append("   (assignment.reminder2Date is null and assignment.assignmentDate <= cast((current_date - cast(config.secondReminder as integer)) as date))")
+		  .append("   (assignment.reminder2Date is null and assignment.assignmentDate <= current_date)")
 		  .append(" )");
 		
 		return dbInstance.getCurrentEntityManager()
diff --git a/src/main/java/org/olat/modules/grading/manager/GradingServiceImpl.java b/src/main/java/org/olat/modules/grading/manager/GradingServiceImpl.java
index 6c29abe8d31f2b90706119c0780c144d501bdf82..90fcb2907bf182a0267a0c58766ba10441fe4942 100644
--- a/src/main/java/org/olat/modules/grading/manager/GradingServiceImpl.java
+++ b/src/main/java/org/olat/modules/grading/manager/GradingServiceImpl.java
@@ -22,6 +22,7 @@ package org.olat.modules.grading.manager;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -101,8 +102,6 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
-import edu.emory.mathcs.backport.java.util.Collections;
-
 /**
  * 
  * Initial date: 13 janv. 2020<br>
@@ -557,7 +556,7 @@ public class GradingServiceImpl implements GradingService, UserDataDeletable, Re
 	@Override
 	public void sendReminders() {
 		// the query returns only an approximation because of the working days part of the configuration
-		List<GradingAssignment> inexactList = gradingAssignmentDao.getGradingAssignmentsToRemind();
+		List<GradingAssignment> inexactList = gradingAssignmentDao.getGradingAssignmentsOpenWithPotentialToRemind();
 		for(GradingAssignment assignment:inexactList) {
 			try {
 				RepositoryEntryGradingConfiguration config = gradingConfigurationDao.getConfiguration(assignment.getReferenceEntry());
diff --git a/src/test/java/org/olat/modules/grading/manager/GraderToIdentityDAOTest.java b/src/test/java/org/olat/modules/grading/manager/GraderToIdentityDAOTest.java
index 36ffb853a52f40242b811ea642553e7e5da75a79..60115b3ce8c8789621220326b995bb1fa5d8c828 100644
--- a/src/test/java/org/olat/modules/grading/manager/GraderToIdentityDAOTest.java
+++ b/src/test/java/org/olat/modules/grading/manager/GraderToIdentityDAOTest.java
@@ -19,6 +19,7 @@
  */
 package org.olat.modules.grading.manager;
 
+import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.List;
@@ -50,8 +51,6 @@ import org.olat.user.AbsenceLeave;
 import org.olat.user.manager.AbsenceLeaveDAO;
 import org.springframework.beans.factory.annotation.Autowired;
 
-import edu.emory.mathcs.backport.java.util.Arrays;
-
 /**
  * 
  * Initial date: 21 janv. 2020<br>
diff --git a/src/test/java/org/olat/modules/grading/manager/GradingAssignmentDAOTest.java b/src/test/java/org/olat/modules/grading/manager/GradingAssignmentDAOTest.java
index 88246e0c2166debe3eb57e9c9018ce227562a810..0f2aa7fa5eae5ca07877aa755702a39a1f800932 100644
--- a/src/test/java/org/olat/modules/grading/manager/GradingAssignmentDAOTest.java
+++ b/src/test/java/org/olat/modules/grading/manager/GradingAssignmentDAOTest.java
@@ -422,11 +422,11 @@ public class GradingAssignmentDAOTest extends OlatTestCase {
 		config.setSecondReminderBody("Content");
 		gradingConfigurationDao.updateConfiguration(config);
 
-		assignment.setAssignmentDate(removeDays(4));
+		assignment.setAssignmentDate(removeDays(5));
 		assignment = gradingAssignmentDao.updateAssignment(assignment);
 		dbInstance.commitAndCloseSession();
 		
-		List<GradingAssignment> assignmentsToRemind = gradingAssignmentDao.getGradingAssignmentsToRemind();
+		List<GradingAssignment> assignmentsToRemind = gradingAssignmentDao.getGradingAssignmentsOpenWithPotentialToRemind();
 		Assert.assertNotNull(assignmentsToRemind);
 		Assert.assertTrue(assignmentsToRemind.contains(assignment));
 	}