diff --git a/horaedb/value.go b/horaedb/value.go
index ef8695c..714ce00 100644
--- a/horaedb/value.go
+++ b/horaedb/value.go
@@ -24,6 +24,7 @@ type DataType int
 const (
 	NULL DataType = iota
 	TIMESTAMP
+	DATE
 	STRING
 	DOUBLE
 	FLOAT
@@ -60,6 +61,10 @@ func (v Value) TimestampValue() int64 {
 	return v.Int64Value()
 }
 
+func (v Value) DateValue() int64 {
+	return v.Int64Value()
+}
+
 func (v Value) StringValue() string {
 	if v.IsNull() {
 		return ""