diff --git a/source/org/jivesoftware/smackx/packet/DelayInformation.java b/source/org/jivesoftware/smackx/packet/DelayInformation.java
index e9e90331a..c04409b3a 100644
--- a/source/org/jivesoftware/smackx/packet/DelayInformation.java
+++ b/source/org/jivesoftware/smackx/packet/DelayInformation.java
@@ -127,7 +127,11 @@ public class DelayInformation implements PacketExtension {
         StringBuffer buf = new StringBuffer();
         buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace()).append(
                 "\"");
-        buf.append(" stamp=\"").append(UTC_FORMAT.format(stamp)).append("\"");
+        buf.append(" stamp=\"");
+        synchronized (UTC_FORMAT) {
+            buf.append(UTC_FORMAT.format(stamp));
+        }
+        buf.append("\"");
         if (from != null && from.length() > 0) {
             buf.append(" from=\"").append(from).append("\"");
         }
diff --git a/source/org/jivesoftware/smackx/provider/DelayInformationProvider.java b/source/org/jivesoftware/smackx/provider/DelayInformationProvider.java
index 2065af6fe..28bab2367 100644
--- a/source/org/jivesoftware/smackx/provider/DelayInformationProvider.java
+++ b/source/org/jivesoftware/smackx/provider/DelayInformationProvider.java
@@ -48,13 +48,17 @@ public class DelayInformationProvider implements PacketExtensionProvider {
     public PacketExtension parseExtension(XmlPullParser parser) throws Exception {
         Date stamp = null;
         try {
-            stamp = DelayInformation.UTC_FORMAT.parse(parser.getAttributeValue("", "stamp"));
+            synchronized (DelayInformation.UTC_FORMAT) {
+                stamp = DelayInformation.UTC_FORMAT.parse(parser.getAttributeValue("", "stamp"));
+            }
         } catch (ParseException e) {
             // Try again but assuming that the date follows JEP-82 format
             // (Jabber Date and Time Profiles) 
             try {
-                stamp = DelayInformation.NEW_UTC_FORMAT
-                        .parse(parser.getAttributeValue("", "stamp"));
+                synchronized (DelayInformation.NEW_UTC_FORMAT) {
+                    stamp = DelayInformation.NEW_UTC_FORMAT
+                            .parse(parser.getAttributeValue("", "stamp"));
+                }
             } catch (ParseException e1) {
                 // Last attempt. Try parsing the date assuming that it does not include milliseconds
                 SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");