diff --git a/src/hdf5_lib.py b/src/hdf5_lib.py
index fe6b73e..5d38910 100644
--- a/src/hdf5_lib.py
+++ b/src/hdf5_lib.py
@@ -64,6 +64,7 @@ def __transfer_file_dict_to_hdf5(h5file, group_name, file_dict):
             # Add dataset's attributes                                
             attributes = dataset.get('attributes', {})
             dataset_obj.attrs.update(attributes)
+        group.attrs['last_update_date'] = utils.created_at().encode('utf-8')
     except Exception as inst: 
         print(inst) 
         logging.error('Failed to transfer data into HDF5: %s', inst)
@@ -178,6 +179,7 @@ def create_hdf5_file_from_filesystem_path(path_to_input_directory: str,
             # Group hierarchy is implicitly defined by the forward slashes
             if not group_name in h5file.keys():                    
                 h5file.create_group(group_name)
+                h5file[group_name].attrs['creation_date'] = utils.created_at().encode('utf-8')
                 #h5file[group_name].attrs.create(name='filtered_file_list',data=convert_string_to_bytes(filtered_filename_list))
                 #h5file[group_name].attrs.create(name='file_list',data=convert_string_to_bytes(filenames_list))
             else:                           
diff --git a/src/hdf5_ops.py b/src/hdf5_ops.py
index 55d862a..b40c2d6 100644
--- a/src/hdf5_ops.py
+++ b/src/hdf5_ops.py
@@ -97,14 +97,16 @@ class HDF5DataOpsManager():
         # Parse value into HDF5 admissible type
         for key in dataset_dict['attributes'].keys():
             value = dataset_dict['attributes'][key] 
-            dataset_dict['attributes'][key] = utils.convert_attrdict_to_np_structured_array(value)
-
-            #name = dataset_dict['name']
-            #data = dataset_dict['data']
-            #dtype = dataset_dict['dtype']
+            if isinstance(key, dict):
+                dataset_dict['attributes'][key] = utils.convert_attrdict_to_np_structured_array(value)
 
+        if not group_name in self.file_obj:
+            self.file_obj.create_group(group_name, track_order=True)
+            self.file_obj[group_name].attrs['creation_date'] = utils.created_at().encode("utf-8")
+            
         self.file_obj[group_name].create_dataset(dataset_dict['name'], data=dataset_dict['data'])
         self.file_obj[group_name][dataset_dict['name']].attrs.update(dataset_dict['attributes'])
+        self.file_obj[group_name].attrs['last_update_date'] = utils.created_at().encode("utf-8")
 
     def append_metadata(self, obj_name, annotation_dict):
         """