diff --git a/UltiSnips/all.snippets b/UltiSnips/all.snippets
index a1db587..8b7079e 100644
--- a/UltiSnips/all.snippets
+++ b/UltiSnips/all.snippets
@@ -85,7 +85,7 @@ snippet ddate "Month DD, YYYY" w
 endsnippet
 
 snippet diso "ISO format datetime" w
-`date +%Y-%m-%dT%H:%M:%S`
+`date +%Y-%m-%dT%H:%M:%S%:z`
 endsnippet
 
 snippet time "hh:mm" w