diff --git a/elastic/client.go b/elastic/client.go
index 659a5871..24bbe3f1 100644
--- a/elastic/client.go
+++ b/elastic/client.go
@@ -144,6 +144,20 @@ type BulkResponseItem struct {
 	Found   bool            `json:"found"`
 }
 
+type MappingResponse struct {
+	Code   int
+	Mapping Mapping
+}
+
+type Mapping map[string]struct {
+	Mappings map[string]struct {
+		Properties map[string]struct {
+			Type	string          `json:"type"`
+			Fields	interface{} 	`json:"fields"`
+		} `json:"properties"`
+	} `json:"mappings"`
+}
+
 func (c *Client) DoRequest(method string, url string, body *bytes.Buffer) (*http.Response, error) {
 	req, err := http.NewRequest(method, url, body)
 	if err != nil {
@@ -249,6 +263,34 @@ func (c *Client) CreateMapping(index string, docType string, mapping map[string]
 	return errors.Trace(err)
 }
 
+func (c *Client) GetMapping(index string, docType string) (*MappingResponse, error){
+	reqUrl := fmt.Sprintf("http://%s/%s/%s/_mapping", c.Addr,
+		url.QueryEscape(index),
+		url.QueryEscape(docType))
+	buf := bytes.NewBuffer(nil)
+	resp, err := c.DoRequest("GET", reqUrl, buf)
+
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	defer resp.Body.Close()
+
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	ret := new(MappingResponse)
+	err = json.Unmarshal(data, &ret.Mapping)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	ret.Code = resp.StatusCode
+	return ret, errors.Trace(err)
+}
+
 func (c *Client) DeleteIndex(index string) error {
 	reqUrl := fmt.Sprintf("http://%s/%s", c.Addr,
 		url.QueryEscape(index))
diff --git a/river/river_test.go b/river/river_test.go
index 98e11636..1cb177c5 100644
--- a/river/river_test.go
+++ b/river/river_test.go
@@ -10,6 +10,7 @@ import (
 	. "github.com/pingcap/check"
 	"github.com/siddontang/go-mysql-elasticsearch/elastic"
 	"github.com/siddontang/go-mysql/client"
+	"github.com/siddontang/go-mysql/mysql"
 )
 
 var my_addr = flag.String("my_addr", "127.0.0.1:3306", "MySQL addr")
@@ -42,6 +43,7 @@ func (s *riverTestSuite) SetUpSuite(c *C) {
             tenum ENUM("e1", "e2", "e3"),
             tset SET("a", "b", "c"),
             tbit BIT(1) default 1,
+            tdatetime DATETIME DEFAULT NULL,
             PRIMARY KEY(id)) ENGINE=INNODB;
     `
 
@@ -214,6 +216,9 @@ func (s *riverTestSuite) testPrepareData(c *C) {
 		table := fmt.Sprintf("test_river_%04d", i)
 		s.testExecute(c, fmt.Sprintf("INSERT INTO %s (id, title, content, tenum, tset) VALUES (?, ?, ?, ?, ?)", table), 5+i, "abc", "hello", "e1", "a,b,c")
 	}
+
+	datetime := time.Now().Format(mysql.TimeFormat)
+	s.testExecute(c, "INSERT INTO test_river (id, title, content, tenum, tset, tdatetime) VALUES (?, ?, ?, ?, ?, ?)", 16, "test datetime", "hello go 16", "e1", "a,b", datetime)
 }
 
 func (s *riverTestSuite) testElasticGet(c *C, id string) *elastic.Response {
@@ -226,6 +231,17 @@ func (s *riverTestSuite) testElasticGet(c *C, id string) *elastic.Response {
 	return r
 }
 
+func (s *riverTestSuite) testElasticMapping(c *C) *elastic.MappingResponse {
+	index := "river"
+	docType := "river"
+
+	r, err := s.r.es.GetMapping(index, docType)
+	c.Assert(err, IsNil)
+
+	c.Assert(r.Mapping[index].Mappings[docType].Properties["tdatetime"].Type, Equals, "date")
+	return r
+}
+
 func testWaitSyncDone(c *C, r *River) {
 	<-r.canal.WaitDumpDone()
 
@@ -250,6 +266,10 @@ func (s *riverTestSuite) TestRiver(c *C) {
 
 	testWaitSyncDone(c, s.r)
 
+	var mr *elastic.MappingResponse
+	mr = s.testElasticMapping(c)
+	c.Assert(mr.Code, Equals, 200)
+
 	var r *elastic.Response
 	r = s.testElasticGet(c, "1")
 	c.Assert(r.Found, Equals, true)
diff --git a/river/sync.go b/river/sync.go
index 8d556b1b..01c0c586 100644
--- a/river/sync.go
+++ b/river/sync.go
@@ -311,6 +311,12 @@ func (r *River) makeReqColumnData(col *schema.TableColumn, value interface{}) in
 		if err == nil && f != nil {
 			return f
 		}
+	case schema.TYPE_DATETIME:
+		switch v := value.(type) {
+		case string:
+			vt, _ := time.ParseInLocation(mysql.TimeFormat, string(v), time.Local)
+			return vt.Format(time.RFC3339)
+		}
 	}
 
 	return value