diff --git a/wis2box_api/plugins/process/station_info.py b/wis2box_api/plugins/process/station_info.py
index 72a7821..4270934 100644
--- a/wis2box_api/plugins/process/station_info.py
+++ b/wis2box_api/plugins/process/station_info.py
@@ -50,34 +50,34 @@
             'keywords': {'en': ['collection', 'topic', 'dataset']},
             'schema': {
                 'type': 'string',
-                'default': None,
+                'default': None
             },
             'minOccurs': 1,
             'maxOccurs': 1,
-            'metadata': None,  # TODO how to use?
+            'metadata': None  # TODO how to use?
         },
         'wigos_station_identifier': {
             'title': {'en': 'WIGOS Station Identifier'},
             'schema': {
                 'type': 'array',
                 'minItems': 1,
-                'items': {'type': 'string'},
+                'items': {'type': 'string'}
             },
             'minOccurs': 0,
             'maxOccurs': 1,
-            'metadata': None,  # TODO how to use?
+            'metadata': None  # TODO how to use?
         },
         'days': {
             'title': {'en': 'Days'},
             'schema': {'type': 'number', 'default': 1},
             'minOccurs': 0,
-            'maxOccurs': 1,
+            'maxOccurs': 1
         },
         'years': {
             'title': {'en': 'Years'},
             'schema': {'type': 'number', 'default': 0},
             'minOccurs': 0,
-            'maxOccurs': 1,
+            'maxOccurs': 1
         },
     },
     'outputs': {
@@ -89,15 +89,15 @@
             },
             'schema': {
                 'type': 'object',
-                'contentMediaType': 'application/json',
-            },
+                'contentMediaType': 'application/json'
+            }
         }
     },
     'example': {
         'inputs': {
-            'collection': 'mwi.mwi_met_centre.data.core.weather.surface-based-observations.SYNOP',  # noqa
+            'collection': 'mwi.mwi_met_centre.data.core.weather.surface-based-observations.SYNOP'  # noqa
         }
-    },
+    }
 }
 
 
@@ -148,7 +148,8 @@ def execute(self, data):
             raise ProcessorExecuteError(msg)
 
         days = data.get('days', 1) + (data.get('years', 0) * 365)
-        date_offset = (datetime.utcnow() - timedelta(days=days)).isoformat()
+        _time_delta = timedelta(days=days, minutes=59, seconds=59)
+        date_offset = (datetime.utcnow() - _time_delta).isoformat()
 
         if CONFIG['resources'].get('stations') is None:
             msg = 'stations collection does not exist'
@@ -182,10 +183,7 @@ def execute(self, data):
                 },
                 'aggs': {
                     'count': {
-                        'terms': {
-                            'field': 'reportId.raw',
-                            'size': 64000
-                        }
+                        'terms': {'field': 'reportId.raw', 'size': 64000}
                     }
                 }
             }