diff --git a/lib/asn1.js b/lib/asn1.js
index dc94496..2377440 100644
--- a/lib/asn1.js
+++ b/lib/asn1.js
@@ -997,7 +997,7 @@ const decodeBacnetDatetime = (buffer, offset) => {
   len += time.len;
   return {
     len: len,
-    value: new Date(date.year, date.month, date.day, time.hour, time.minute, time.second, time.millisecond)
+    value: new Date(date.value.value.getFullYear(), date.value.value.getMonth() -1 , date.value.value.getDate(), time.value.value.getHours(), time.value.value.getMinutes(), time.value.value.getSeconds(), time.value.value.getMilliseconds())};
   };
 };