diff --git a/tools/arkmanager b/tools/arkmanager
index 0ed033d..922d3fd 100755
--- a/tools/arkmanager
+++ b/tools/arkmanager
@@ -172,7 +172,7 @@ declare -A modsrcdirs
 # timestamp
 #
 timestamp() {
-  date +%T
+  date +"%Y-%m-%d %H:%M:%S"
 }
 
 #