[server] Don't use shared instance in multi-threaded app

1 files changed, 2 insertions, 1 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/DateTimeHelper.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/DateTimeHelper.java
index 2ab8e9fb..0b02bbf9 100644
--- a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/DateTimeHelper.java
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/DateTimeHelper.java
@@ -9,7 +9,6 @@ import org.apache.log4j.Logger;
 import org.jdatepicker.JDatePicker;
 
 public class DateTimeHelper {
-	private static final Calendar calendar = Calendar.getInstance();
 
 	private final static Logger LOGGER = Logger.getLogger(DateTimeHelper.class);
 
@@ -28,6 +27,7 @@ public class DateTimeHelper {
 		int days = datePicker.getModel().getDay();
 		// start time from the Spinner
 		Date time = (Date) timeSpinner.getValue();
+		Calendar calendar = Calendar.getInstance();
 		calendar.setTime(time);
 		int hours = calendar.get(Calendar.HOUR_OF_DAY);
 		int minutes = calendar.get(Calendar.MINUTE);
@@ -38,6 +38,7 @@ public class DateTimeHelper {
 	}
 
 	public static Date addDaysTo(Date start, int days) {
+		Calendar calendar = Calendar.getInstance();
 		calendar.setTime(start);
 		calendar.add(Calendar.DAY_OF_MONTH, days);
 		return calendar.getTime();