diff --git a/utils/time.go b/utils/time.go
index efa7515..1531dc1 100644
--- a/utils/time.go
+++ b/utils/time.go
@@ -9,3 +9,15 @@ func VeryBeginOfDate(date time.Time) time.Time {
 func VeryEndOfDate(date time.Time) time.Time {
 	return time.Date(date.Year(), date.Month(), date.Day(), 23, 59, 59, 999999999, date.Location())
 }
+
+func IsNextMonth(t1, t2 time.Time) bool {
+	var differYear, differMonth int
+	if t1.After(t2) {
+		differYear = t1.Year() - t2.Year()
+		differMonth = int(t1.Month() - t2.Month())
+	} else {
+		differYear = t2.Year() - t1.Year()
+		differMonth = int(t2.Month() - t1.Month())
+	}
+	return (differMonth == -11 && differYear == 1) || (differMonth == 1 && differYear == 0)
+}