diff --git a/mergefiles.py b/mergefiles.py
index e79b80e..e459677 100644
--- a/mergefiles.py
+++ b/mergefiles.py
@@ -1,4 +1,5 @@
 import os
+from datetime import datetime
 
 def merge_files(file_paths):
     # Dictionary to hold file contents by extension
@@ -12,9 +13,20 @@ def merge_files(file_paths):
         with open(file_path, 'r') as file:
             files_by_extension[ext].append(file.read())
 
+    # Ensure the .old directory exists
+    old_dir = '.old'
+    if not os.path.exists(old_dir):
+        os.makedirs(old_dir)
+
     # Write merged contents to new files
     for ext, contents in files_by_extension.items():
-        merged_file_path = f'merged{ext}'
+        current_date = datetime.now().strftime("%Y-%m-%d")
+        merged_file_path = f'{current_date}{ext}'
+
+        # Move existing merged file to .old directory
+        if os.path.exists(merged_file_path):
+            os.rename(merged_file_path, os.path.join(old_dir, f'{current_date}{ext}'))
+
         with open(merged_file_path, 'w') as merged_file:
             for content in contents:
                 merged_file.write(content)