diff --git a/prefsCleaner.bat b/prefsCleaner.bat
index eb05a0b..483df36 100644
--- a/prefsCleaner.bat
+++ b/prefsCleaner.bat
@@ -30,12 +30,12 @@ IF NOT EXIST "user.js" (CALL :abort "user.js not found in the current directory.
 IF NOT EXIST "prefs.js" (CALL :abort "prefs.js not found in the current directory." 30)
 CALL :strlenCheck
 CALL :FFcheck
+
 CALL :message "Backing up prefs.js..."
 FOR /F "usebackq tokens=1,2 delims==" %%i IN (`wmic os get LocalDateTime /VALUE 2^>NUL`) DO IF '.%%i.'=='.LocalDateTime.' SET ldt=%%j
-SET ldt=%ldt:~0,4%-%ldt:~4,2%-%ldt:~6,2%_%ldt:~8,2%%ldt:~10,2%
-REM For ISO format use:
-REM SET ldt=%ldt:~0,4%%ldt:~4,2%%ldt:~6,2%T%ldt:~8,2%%ldt:~10,2%%ldt:~12,6%
+SET ldt=%ldt:~0,8%_%ldt:~8,6%
 COPY /B /V /Y prefs.js "prefs-backup-%ldt%.js"
+
 CALL :message "Cleaning prefs.js..."
 CALL :cleanup
 CALL :message "All done!"