diff --git a/Hikvision.go b/Hikvision.go
index 2f56f6f..a3cdb00 100644
--- a/Hikvision.go
+++ b/Hikvision.go
@@ -23,7 +23,7 @@ var (
 	initNvr                  func(unsafe.Pointer, string, string, string, string, int) bool
 	checkTimeRegionWithMonth func(core unsafe.Pointer, year int, month int) string
 	checkTimeRegionWithDay   func(core unsafe.Pointer, year int, month int, day int) string
-	nvrUTCDiff               func(core unsafe.Pointer)
+	nvrUTCDiff               func(core unsafe.Pointer) int
 )
 
 func init() {
@@ -115,6 +115,9 @@ func (h *HIKNvr) CheckTimeRegionWithMonth(year int, month int) string {
 func (h *HIKNvr) CheckTimeRegionWithDay(year int, month int, day int) string {
 	return checkTimeRegionWithDay(h.core, year, month, day)
 }
+func (h *HIKNvr) UTCDiff() int {
+	return nvrUTCDiff(h.core)
+}
 
 func (h *HIKBallCamera) WarpingPtByHomography(matrix []float64, p Point) Point {
 	var x, y, z float64