diff --git a/setup/so-setup b/setup/so-setup
index 5356965aa..88a2fd045 100755
--- a/setup/so-setup
+++ b/setup/so-setup
@@ -59,8 +59,8 @@ while [[ $# -gt 0 ]]; do
 done
 
 # Preserve old setup/error logs
-[ -f "$error_log" ] && mv "$error_log" "$error_log.$(+%Y-%m-%dT%H:%M:%S)"
-[ -f "$setup_log" ] && mv "$setup_log" "$setup_log.$(+%Y-%m-%dT%H:%M:%S)"
+[ -f "$error_log" ] && mv "$error_log" "$error_log.$(date +%Y-%m-%dT%H:%M:%S)"
+[ -f "$setup_log" ] && mv "$setup_log" "$setup_log.$(date +%Y-%m-%dT%H:%M:%S)"
 
 # Let's see what OS we are dealing with here
 detect_os