OO-4001: Subtract days to select curriculum elements to create data collection

src/main/java/org/olat/modules/quality/generator/ProviderHelper.java

@@ -41,6 +41,14 @@ import org.olat.core.util.StringHelper;
 public class ProviderHelper {
 
 	private static final String DELIMITER = ",";
+	
+	public static Date subtractDays(Date date, String daysToAdd) {
+		int days = Integer.parseInt(daysToAdd);
+		Calendar c = Calendar.getInstance();
+		c.setTime(date);
+		c.add(Calendar.DATE, -days);
+		return c.getTime();
+	}
 
 	public static Date addDays(Date date, String daysToAdd) {
 		int days = Integer.parseInt(daysToAdd);

src/main/java/org/olat/modules/quality/generator/provider/curriculumelement/CurriculumElementProvider.java

@@ -21,6 +21,7 @@ package org.olat.modules.quality.generator.provider.curriculumelement;
 
 import static java.util.Collections.singletonList;
 import static org.olat.modules.quality.generator.ProviderHelper.addDays;
+import static org.olat.modules.quality.generator.ProviderHelper.subtractDays;
 
 import java.util.ArrayList;
 import java.util.Date;
@@ -237,9 +238,9 @@ public class CurriculumElementProvider implements QualityGeneratorProvider {
 		searchParams.setCeTypeKey(ceTypeKey);
 
 		String dueDateDays = configs.getValue(CONFIG_KEY_DUE_DATE_DAYS);
-		Date dueDateFrom = addDays(fromDate, dueDateDays);
+		Date dueDateFrom = subtractDays(fromDate, dueDateDays);
 		searchParams.setFrom(dueDateFrom);
-		Date dueDateTo = addDays(toDate, dueDateDays);
+		Date dueDateTo = subtractDays(toDate, dueDateDays);
 		searchParams.setTo(dueDateTo);
 		
 		String dueDateType = configs.getValue(CONFIG_KEY_DUE_DATE_TYPE);