diff --git a/message/time.go b/message/time.go
index 76c5fad..4aa456a 100644
--- a/message/time.go
+++ b/message/time.go
@@ -1,4 +1,4 @@
 package message
 
 // Timestamp as used in internet mail messages.
-const RFC5322Z = "02 Jan 2006 15:04 -0700"
+const RFC5322Z = "2 Jan 2006 15:04:05 -0700"