Add millisecond format to date parsing

src/main/java/com/box/sdk/BoxDateFormat.java

@@ -10,7 +10,7 @@
  * Contains methods for parsing and formatting dates for use with the Box API.
  */
 public final class BoxDateFormat {
-    private static final ThreadLocal<DateFormat> THREAD_LOCAL_DATE_FORMAT = new ThreadLocal<DateFormat>() {
+    private static final ThreadLocal<DateFormat> THREAD_LOCAL_DATE_FORMAT_SECONDS = new ThreadLocal<DateFormat>() {
         @Override
         protected DateFormat initialValue() {
             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX");
@@ -19,6 +19,15 @@ protected DateFormat initialValue() {
         }
     };
 
+    private static final ThreadLocal<DateFormat> THREAD_LOCAL_DATE_FORMAT_MILLISECONDS = new ThreadLocal<DateFormat>() {
+        @Override
+        protected DateFormat initialValue() {
+            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX");
+            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
+            return sdf;
+        }
+    };
+
     private BoxDateFormat() { }
 
     /**
@@ -28,7 +37,15 @@ private BoxDateFormat() { }
      * @throws ParseException if the string cannot be parsed into a valid date.
      */
     public static Date parse(String dateString) throws ParseException {
-        return THREAD_LOCAL_DATE_FORMAT.get().parse(dateString);
+        try {
+            return THREAD_LOCAL_DATE_FORMAT_SECONDS.get().parse(dateString);
+        } catch (ParseException pe) {
+            try {
+                return THREAD_LOCAL_DATE_FORMAT_MILLISECONDS.get().parse(dateString);
+            } catch (ParseException pe2) {
+                throw pe2;
+            }
+        }
     }
 
     /**
@@ -37,7 +54,7 @@ public static Date parse(String dateString) throws ParseException {
      * @return      a string containing the formatted date.
      */
     public static String format(Date date) {
-        return THREAD_LOCAL_DATE_FORMAT.get().format(date);
+        return THREAD_LOCAL_DATE_FORMAT_SECONDS.get().format(date);
     }
 
 }

src/test/java/com/box/sdk/MetadataTest.java

@@ -296,22 +296,30 @@ public void testMultiSelectMetadataCRUD() {
 
     @Test
     @Category(UnitTest.class)
-    public void getValues() {
+    public void testGetValues() {
+        // Run test with various Date formats.
+        this.getValues("\"2017-10-10T22:10:00-08:00\"", 1507702200000L);
+        this.getValues("\"2017-10-10T22:10:00.000-08:00\"", 1507702200000L);
+        this.getValues("\"2017-10-10T22:10:00.123-08:00\"", 1507702200123L);
+        this.getValues("\"2017-10-10T22:10:00.100-08:00\"", 1507702200100L);
+    }
+
+    public void getValues(String dateString, Long dateLong) {
 
         final String stringValue = "Q1 plans";
         final int intValue = 123456;
         final String[] arrayValue = new String[2];
         arrayValue[0] = "internal";
         arrayValue[1] = "internalEng";
         Date dateValue = new Date();
-        dateValue.setTime(1507702200000L);
+        dateValue.setTime(dateLong);
 
         String json = "{\n"
                 + "    \"audiences\": [\"internal\", \"internalEng\"],\n"
                 + "    \"documentType\": \"" + stringValue + "\",\n"
                 + "    \"competitiveDocument\": \"no\",\n"
                 + "    \"status\": \"active\",\n"
-                + "    \"deadline\": \"2017-10-10T22:10:00-08:00\",\n"
+                + "    \"deadline\": " + dateString + ",\n"
                 + "    \"capacity\": " + intValue + ",\n"
                 + "    \"currentState\": \"proposal\",\n"
                 + "    \"$type\": \"marketingCollateral-d086c908-2498-4d3e-8a1f-01e82bfc2abe\",\n"