diff --git a/rxlib/src/main/java/org/rx/bean/DateTime.java b/rxlib/src/main/java/org/rx/bean/DateTime.java
index 5791fb12..e27b1b37 100644
--- a/rxlib/src/main/java/org/rx/bean/DateTime.java
+++ b/rxlib/src/main/java/org/rx/bean/DateTime.java
@@ -50,7 +50,7 @@ public static DateTime utcNow() {
     public static DateTime valueOf(@NonNull String dateString) {
         Throwable lastEx = null;
         int offset = dateString.length() >= 23 ? 0 : 3;
-        int len = 3, fb = 6;
+        int len = offset + 3, fb = 6;
         for (int i = offset; i < len; i++) {
             try {
                 return valueOf(dateString, FORMATS[i]);
diff --git a/rxlib/src/test/java/org/rx/core/TestCore.java b/rxlib/src/test/java/org/rx/core/TestCore.java
index 0d5ac19d..acbba792 100644
--- a/rxlib/src/test/java/org/rx/core/TestCore.java
+++ b/rxlib/src/test/java/org/rx/core/TestCore.java
@@ -857,6 +857,10 @@ public void rasTest() {
 
     @Test
     public void json() {
+        System.out.println(DateTime.valueOf("2020-02-04 00:00:00"));
+        System.out.println(DateTime.valueOf("2020-02-05 00:00:00.000"));
+        System.out.println(DateTime.valueOf("20200206000000000"));
+
 //        RxConfig.INSTANCE.getJsonSkipTypes().add(ErrorBean.class);
         Object[] args = new Object[]{str_name_wyf, proxy(HttpServletResponse.class, (m, i) -> {
             throw new InvalidException("wont reach");