diff --git a/templates.go b/templates.go
index 34ac3bd..62398c1 100644
--- a/templates.go
+++ b/templates.go
@@ -9,7 +9,7 @@ const atom_xml = `
{{ .Title }}
-{{ .Updated }}
+{{ .Updated.Format "2006-01-02T15:04:05Z07:00" }}
{{ .URL }}{{ .Path }}
{{- $url := .URL -}}
{{- range .Entries }}