diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index a4f47f85..761feab7 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -1852,7 +1852,7 @@ def get_startdate_time_zone(r,row,startdatetime=None):
         timezone_str = 'UTC'
         try:
             startdatetime = timezone.make_aware(startdatetime)
-        except ValueError:
+        except ValueError: # pragma: no cover
             pass
 
         try:
@@ -1873,11 +1873,11 @@ def get_startdate_time_zone(r,row,startdatetime=None):
                 startdatetime = pytz.timezone(timezone_str).localize(
                     row.rowdatetime
                     )
-            except ValueError:
+            except ValueError: # pragma: no cover
                 startdatetime = startdatetime.astimezone(
                     pytz.timezone(timezone_str)
                     )
-        except KeyError:
+        except KeyError: # pragma: no cover
             timezone_str = r.defaulttimezone
     else:
         timezone_str = str(startdatetime.tzinfo)