diff --git a/types/time.go b/types/time.go
index fa06db224e..b5474a28dd 100644
--- a/types/time.go
+++ b/types/time.go
@@ -682,6 +682,9 @@ func parseDatetime(sc *stmtctx.StatementContext, str string, fsp int, isFloat bo
 	case 3:
 		// YYYY-MM-DD
 		err = scanTimeArgs(seps, &year, &month, &day)
+	case 4:
+		// YYYY-MM-DD HH
+		err = scanTimeArgs(seps, &year, &month, &day, &hour)
 	case 5:
 		// YYYY-MM-DD HH-MM
 		err = scanTimeArgs(seps, &year, &month, &day, &hour, &minute)
diff --git a/types/time_test.go b/types/time_test.go
index 1e6698949e..46e659c789 100644
--- a/types/time_test.go
+++ b/types/time_test.go
@@ -62,6 +62,8 @@ func (s *testTimeSuite) TestDateTime(c *C) {
 		{"170102036", "2017-01-02 03:06:00"},
 		{"170102039.", "2017-01-02 03:09:00"},
 		{"170102037.11", "2017-01-02 03:07:11.00"},
+		{"2018-01-01 18", "2018-01-01 18:00:00"},
+		{"18-01-01 18", "2018-01-01 18:00:00"},
 	}
 
 	for _, test := range table {