diff --git a/internal/v2signer.go b/internal/v2signer.go
index c8321463..53174c68 100644
--- a/internal/v2signer.go
+++ b/internal/v2signer.go
@@ -39,7 +39,7 @@ var (
 const (
 	signatureVersion = "2"
 	signatureMethod  = "HmacSHA1"
-	timeFormat       = "Mon, 2 Jan 2006 15:04:05 +0000"
+	timeFormat       = "Mon, 02 Jan 2006 15:04:05 +0000"
 )
 
 var subresources = []string{