fix: 解决在解析ISO8601不带毫秒的数值时，毫秒依然有值的问题。

fixed #1884

src/main/java/com/alibaba/fastjson/parser/JSONScanner.java

@@ -510,6 +510,7 @@ private boolean scanISO8601DateIfMatch(boolean strict, int rest) {
 
         char dot = charAt(bp + date_len + 9);
         int millisLen = -1; // 有可能没有毫秒区域，没有毫秒区域的时候下一个字符位置有可能是'Z'、'+'、'-'
+        int millis = 0;
         if (dot == '.') { // 0000-00-00T00:00:00.000
             if (rest < date_len + 11) {
                 return false;
@@ -519,7 +520,7 @@ private boolean scanISO8601DateIfMatch(boolean strict, int rest) {
             if (S0 < '0' || S0 > '9') {
                 return false;
             }
-            int millis = S0 - '0';
+            millis = S0 - '0';
             millisLen = 1;
 
             if (rest > date_len + 11) {
@@ -537,9 +538,8 @@ private boolean scanISO8601DateIfMatch(boolean strict, int rest) {
                     millisLen = 3;
                 }
             }
-
-            calendar.set(Calendar.MILLISECOND, millis);
         }
+        calendar.set(Calendar.MILLISECOND, millis);
 
         int timzeZoneLength = 0;
         char timeZoneFlag = charAt(bp + date_len + 10 + millisLen);

src/test/java/com/alibaba/fastjson/deserializer/TestISO8601Date.java

@@ -0,0 +1,61 @@
+package com.alibaba.fastjson.deserializer;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
+import com.alibaba.fastjson.parser.Feature;
+import org.junit.*;
+
+import java.util.*;
+
+/**
+ * Issue #1884 Test Case
+ *
+ * @author cnzgray@qq.com
+ * @since 2018-05-31 17:15
+ */
+public class TestISO8601Date {
+    @Before
+    public void init() {
+        JSON.DEFAULT_PARSER_FEATURE |= Feature.AllowISO8601DateFormat.mask;
+    }
+
+    @Test
+    public void testBug1884() {
+        Calendar cale = Calendar.getInstance();
+        cale.clear();
+        cale.setTimeZone( TimeZone.getTimeZone( "GMT+7" ) );
+        cale.set( 2018, Calendar.MAY, 31, 19, 13, 42 );
+        Date date = cale.getTime();
+
+        String s1 = "{date: \"2018-05-31T19:13:42+07:00\"}"; // 错误的
+        String s2 = "{date: \"2018-05-31T19:13:42.000+07:00\"}"; // 正确的
+        Date date1 = JSON.parseObject( s1, JSONObject.class ).getDate( "date" );
+        Date date2 = JSON.parseObject( s2, JSONObject.class ).getDate( "date" );
+        assertEquals(date1, date2);
+        assertEquals(date, date1);
+        assertEquals(date, date2);
+    }
+
+    @Test
+    public void testBug376() {
+        Calendar cale = Calendar.getInstance();
+        cale.clear();
+        cale.setTimeZone( TimeZone.getTimeZone( "GMT" ) );
+        cale.set( 2018, Calendar.MAY, 31, 19, 13, 42 );
+        Date date = cale.getTime();
+
+        String s1 = "{date: \"2018-05-31T19:13:42Z\"}";
+        String s2 = "{date: \"2018-05-31T19:13:42.000Z\"}";
+
+        Date date1 = JSON.parseObject( s1, JSONObject.class ).getDate( "date" );
+        Date date2 = JSON.parseObject( s2, JSONObject.class ).getDate( "date" );
+
+        assertEquals( date1, date2 );
+        assertEquals( date, date1 );
+        assertEquals( date, date2 );
+    }
+
+    private void assertEquals( Date expected, Date actual ) {
+        Assert.assertEquals( 0, expected.compareTo( actual ) );
+    }
+}