diff --git a/pysqm/read.py b/pysqm/read.py
index fbcdc0e0043b391c72f025be0b38b7523f9fc453..3e3afecb65a65a8cdc9cf110735caee0feb910f9 100644
--- a/pysqm/read.py
+++ b/pysqm/read.py
@@ -181,8 +181,7 @@ class device(observatory):
 
     def define_filenames(self):
         # Filenames should follow a standard based on observatory name and date.
-        date_time_file = self.local_datetime(\
-         self.read_datetime())-datetime.timedelta(hours=12)
+        date_time_file = self.read_datetime()-datetime.timedelta(hours=12)
         date_file = date_time_file.date()
         yearmonth = str(date_file)[0:7].replace('-','')
         yearmonthday = str(date_file)[0:10].replace('-','')