diff --git a/src/java/org/apache/commons/lang3/time/DateUtils.java b/src/java/org/apache/commons/lang3/time/DateUtils.java
index 6581638af..8cb019e06 100644
--- a/src/java/org/apache/commons/lang3/time/DateUtils.java
+++ b/src/java/org/apache/commons/lang3/time/DateUtils.java
@@ -290,14 +290,29 @@ public class DateUtils {
         SimpleDateFormat parser = null;
         ParsePosition pos = new ParsePosition(0);
         for (int i = 0; i < parsePatterns.length; i++) {
+
+            String pattern = parsePatterns[i];
+
+            // LANG-530 - need to make sure 'ZZ' output doesn't get passed to SimpleDateFormat
+            if (parsePatterns[i].endsWith("ZZ")) {
+                pattern = pattern.substring(0, pattern.length() - 1);
+            }
+            
             if (i == 0) {
-                parser = new SimpleDateFormat(parsePatterns[0]);
+                parser = new SimpleDateFormat(pattern);
             } else {
-                parser.applyPattern(parsePatterns[i]); // cannot be null if i != 0
+                parser.applyPattern(pattern); // cannot be null if i != 0
             }
             pos.setIndex(0);
-            Date date = parser.parse(str, pos);
-            if (date != null && pos.getIndex() == str.length()) {
+
+            String str2 = str;
+            // LANG-530 - need to make sure 'ZZ' output doesn't hit SimpleDateFormat as it will ParseException
+            if (parsePatterns[i].endsWith("ZZ")) {
+                str2 = str.replaceAll("([-+][0-9][0-9]):([0-9][0-9])$", "$1$2"); 
+            }
+
+            Date date = parser.parse(str2, pos);
+            if (date != null && pos.getIndex() == str2.length()) {
                 return date;
             }
         }
diff --git a/src/test/org/apache/commons/lang3/time/DateUtilsTest.java b/src/test/org/apache/commons/lang3/time/DateUtilsTest.java
index c742db20c..8198bf05f 100644
--- a/src/test/org/apache/commons/lang3/time/DateUtilsTest.java
+++ b/src/test/org/apache/commons/lang3/time/DateUtilsTest.java
@@ -1156,6 +1156,15 @@ public class DateUtilsTest extends TestCase {
         // restore default time zone
         TimeZone.setDefault(defaultZone);
     }
+
+    // http://issues.apache.org/jira/browse/LANG-520
+    public void testLang520() throws ParseException {
+        Date d = new Date();
+        String isoDateStr = DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(d);
+        Date d2 = DateUtils.parseDate(isoDateStr, new String[] { DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.getPattern() });
+        // the format loses milliseconds so have to reintroduce them
+        assertEquals("Date not equal to itself ISO formatted and parsed", d.getTime(), d2.getTime() + d.getTime() % 1000); 
+    }
     
     /**
      * Tests various values with the ceiling method