diff --git a/util.go b/util.go
index a2ab8af..ee362fa 100644
--- a/util.go
+++ b/util.go
@@ -5,7 +5,7 @@ import (
 )
 
 func toDate(d uint32) time.Time {
-	t, _ := time.Parse("2006-01-02T15:04:05+07:00", "0001-01-01 00:00:00+00:00")
+	t, _ := time.Parse("2006-01-02T15:04:05+07:00", "0000-01-01 00:00:00+00:00")
 	t = t.AddDate(0, 0, int(d))
 	return t
 }