fixes #65

Author: chenyan71

src/main/java/com/networknt/schema/JsonMetaSchema.java

@@ -47,8 +47,8 @@ private static class DraftV4 {
         public static final List<Format> BUILTIN_FORMATS = new ArrayList<Format>();
         static {
             BUILTIN_FORMATS.add(pattern("date-time", 
-                    "^\\d{4}-(?:0[0-9]{1}|1[0-2]{1})-[0-9]{2}[tT ]\\d{2}:\\d{2}:\\d{2}(\\.\\d+)?([zZ]|[+-]\\d{2}:\\d{2})$"));
-            BUILTIN_FORMATS.add(pattern("date", "^\\d{4}-(?:0[0-9]{1}|1[0-2]{1})-[0-9]{2}$"));
+                    "^\\d{4}-(?:0[0-9]{1}|1[0-2]{1})-(0?[1-9]|[12][0-9]|3[01])[tT ]\\d{2}:\\d{2}:\\d{2}(\\.\\d+)?([zZ]|[+-]\\d{2}:\\d{2})$"));
+            BUILTIN_FORMATS.add(pattern("date", "^\\d{4}-(?:0[0-9]{1}|1[0-2]{1})-(0?[1-9]|[12][0-9]|3[01])$"));
             BUILTIN_FORMATS.add(pattern("time", "^\\d{2}:\\d{2}:\\d{2}$"));
             BUILTIN_FORMATS.add(pattern("email", "^\\S+@\\S+$"));
             BUILTIN_FORMATS.add(pattern("ip-address", 

src/test/resources/tests/optional/format.json

@@ -13,13 +13,54 @@
                 "data": "06/19/1963 08:30:06 PST",
                 "valid": false
             },
+            {
+                "description": "an invalid date-time string",
+                "data": "1963-13-25T08:30:06.283185Z",
+                "valid": false
+            },
+            {
+                "description": "an invalid date-time string",
+                "data": "1963-12-35T08:30:06.283185Z",
+                "valid": false
+            },
+            {
+                "description": "an invalid date-time string",
+                "data": "1963-12-31T08:30:06.283185Z",
+                "valid": true
+            },
             {
                 "description": "only RFC3339 not all of ISO 8601 are valid",
                 "data": "2013-350T01:01:01",
                 "valid": false
             }
         ]
     },
+    {
+        "description": "validation of date strings",
+        "schema": {"format": "date"},
+        "tests": [
+            {
+                "description": "an invalid date string",
+                "data": "1963-13-25",
+                "valid": false
+            },
+            {
+                "description": "an invalid date string",
+                "data": "1963-12-35",
+                "valid": false
+            },
+            {
+                "description": "an invalid datee string",
+                "data": "1963-12-31",
+                "valid": true
+            },
+            {
+                "description": "only RFC3339 not all of ISO 8601 are valid",
+                "data": "2013-35",
+                "valid": false
+            }
+        ]
+    },
     {
         "description": "validation of URIs",
         "schema": {"format": "uri"},