diff --git a/main/extra_func.py b/main/extra_func.py
index c41625a..1aade32 100644
--- a/main/extra_func.py
+++ b/main/extra_func.py
@@ -373,7 +373,7 @@ class StatisticData:
             for key, value in stat.items():
                 current_month_start = max(self.start_date, date(year=key.year, month=key.month, day=1))
                 current_month_end = min(self.end_date, last_day_of_month(date(year=key.year, month=key.month, day=1)))
-                index = ' - '.join([str(current_month_start), str(current_month_end)])
+                index = (current_month_start, current_month_end)
                 if new_stat.get(index):
                     new_stat[index] += value
                 else:
diff --git a/main/templates/pages/statistic.html b/main/templates/pages/statistic.html
index 202d8f2..87bea80 100644
--- a/main/templates/pages/statistic.html
+++ b/main/templates/pages/statistic.html
@@ -91,7 +91,7 @@
         {% if interval == 'days' %}
           <td scope="col">{{ date | date:'d.m' }}</td>
         {% else %}
-        <td scope="col">{{ date }}</td>
+        <td scope="col">{{ date.1 | date:'F'  }}</td>
         {% endif %}
         {% endfor %}
       </tr>