diff --git a/django/views/generic/date_based.py b/django/views/generic/date_based.py
index b467efdd75..ca4b4b86e3 100644
--- a/django/views/generic/date_based.py
+++ b/django/views/generic/date_based.py
@@ -108,14 +108,10 @@ def archive_month(request, year, month, app_label, module_name, date_field,
     now = datetime.datetime.now()
     # Calculate first and last day of month, for use in a date-range lookup.
     first_day = date.replace(day=1)
-    last_day = date
-    for i in (31, 30, 29, 28):
-        try:
-            last_day = last_day.replace(day=i)
-        except ValueError:
-            continue
-        else:
-            break
+    if first_day.month == 12:
+        last_day = first_day.replace(year=first_day.year + 1, month=1)
+    else:
+        last_day = first_day.replace(month=first_day.month + 1)
     lookup_kwargs = {'%s__range' % date_field: (first_day, last_day)}
     # Only bother to check current date if the month isn't in the past.
     if last_day >= now.date():