diff --git a/mlair/run_modules/post_processing.py b/mlair/run_modules/post_processing.py
index 8c5080f2cc64fe0f1391457d0907f5ba109a92df..7dc61f89967b5992434e948fe2ba1fc37a4b651b 100644
--- a/mlair/run_modules/post_processing.py
+++ b/mlair/run_modules/post_processing.py
@@ -13,6 +13,7 @@ from typing import Dict, Tuple, Union, List, Callable
 import numpy as np
 import pandas as pd
 import xarray as xr
+import datetime as dt
 
 from mlair.configuration import path_config
 from mlair.data_handler import Bootstraps, KerasIterator