diff --git a/custom-recipes/pi-system-retrieve-list/recipe.json b/custom-recipes/pi-system-retrieve-list/recipe.json
index 7b260f9..860efd4 100644
--- a/custom-recipes/pi-system-retrieve-list/recipe.json
+++ b/custom-recipes/pi-system-retrieve-list/recipe.json
@@ -131,8 +131,8 @@
         {
             "name": "use_start_time_column",
             "label": "Use start time value per row",
-            "description": "Description here",
-            "visibilityCondition": "false && (['InterpolatedData', 'RecordedData', 'PlotData', 'EventFrames'].includes(model.data_type))",
+            "description": "",
+            "visibilityCondition": "['InterpolatedData', 'RecordedData', 'PlotData', 'EventFrames'].includes(model.data_type)",
             "type": "BOOLEAN",
             "defaultValue": false
         },
@@ -140,7 +140,7 @@
             "visibilityCondition": "model.use_start_time_column==true && (['InterpolatedData', 'RecordedData', 'PlotData', 'EventFrames'].includes(model.data_type))",
             "name": "start_time_column",
             "label": "Start times' column",
-            "description": "Optional",
+            "description": "Column type must be string",
             "type": "COLUMN",
             "columnRole": "input_dataset"
         },
@@ -154,9 +154,9 @@
         },
         {
             "name": "use_end_time_column",
-            "label": "Use start time value per row",
+            "label": "Use end time value per row",
             "description": "",
-            "visibilityCondition": "false && (['InterpolatedData', 'RecordedData', 'PlotData', 'EventFrames'].includes(model.data_type))",
+            "visibilityCondition": "['InterpolatedData', 'RecordedData', 'PlotData', 'EventFrames'].includes(model.data_type)",
             "type": "BOOLEAN",
             "defaultValue": false
         },
@@ -164,7 +164,7 @@
             "visibilityCondition": "model.use_end_time_column==true && (['InterpolatedData', 'RecordedData', 'PlotData', 'EventFrames'].includes(model.data_type))",
             "name": "end_time_column",
             "label": "End times' column",
-            "description": "Optional",
+            "description": "Column type must be string",
             "type": "COLUMN",
             "columnRole": "input_dataset"
         },
diff --git a/custom-recipes/pi-system-retrieve-list/recipe.py b/custom-recipes/pi-system-retrieve-list/recipe.py
index 0629902..ee0e6af 100644
--- a/custom-recipes/pi-system-retrieve-list/recipe.py
+++ b/custom-recipes/pi-system-retrieve-list/recipe.py
@@ -90,10 +90,8 @@
                 # make sure all OSIsoft time string format are evaluated at the same time
                 # rather than at every request, at least for start / end times set in the UI
                 time_not_parsed = False
-                if not use_start_time_column:
-                    start_time = client.parse_pi_time(start_time)
-                if not use_end_time_column:
-                    end_time = client.parse_pi_time(end_time)
+                start_time = client.parse_pi_time(start_time)
+                end_time = client.parse_pi_time(end_time)
                 sync_time = client.parse_pi_time(sync_time)
 
         object_id = input_parameters_row.get(path_column)