Add admin filter by timestamp

It's backed by django-admin-rangefilter if able.

setup.py

@@ -11,6 +11,7 @@ setup(
     maintainer='Alieh Rymašeŭski',
     description='Audit log app for Django',
     install_requires=[
+        'django-admin-rangefilter>=0.5.0',
         'django-jsonfield>=1.0.0',
         'python-dateutil>=2.6.0',
     ],

src/auditlog/admin.py

@@ -6,7 +6,7 @@ from django.utils.functional import cached_property
 
 from .models import LogEntry
 from .mixins import LogEntryAdminMixin
-from .filters import ResourceTypeFilter, FieldFilter
+from .filters import ResourceTypeFilter, FieldFilter, get_timestamp_filter
 
 
 class TimeLimitedPaginator(Paginator):
@@ -30,7 +30,7 @@ class TimeLimitedPaginator(Paginator):
 class LogEntryAdmin(admin.ModelAdmin, LogEntryAdminMixin):
     list_display = ['created', 'resource_url', 'action', 'msg_short', 'user_url']
     search_fields = ['timestamp', 'object_repr', 'changes', 'actor__first_name', 'actor__last_name']
-    list_filter = ['action', ResourceTypeFilter, FieldFilter]
+    list_filter = ['action', ResourceTypeFilter, FieldFilter, ('timestamp', get_timestamp_filter())]
     readonly_fields = ['created', 'resource_url', 'action', 'user_url', 'msg']
     fieldsets = [
         (None, {'fields': ['created', 'user_url', 'resource_url']}),

src/auditlog/filters.py

@@ -1,4 +1,6 @@
+from django.apps import apps
 from django.contrib.admin import SimpleListFilter
+from django.contrib.admin.filters import DateFieldListFilter
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.postgres.fields import JSONField
 from django.db import connection
@@ -64,3 +66,15 @@ class FieldFilter(SimpleListFilter):
             queryset.annotate(changes_json=Cast("changes", JSONField()))
             .filter(**{'changes_json__{}__isnull'.format(self.value()): False})
         )
+
+
+def get_timestamp_filter():
+    """Returns rangefilter filter class if able or a simple list filter as a fallback."""
+    if apps.is_installed("rangefilter"):
+        try:
+            from rangefilter.filter import DateTimeRangeFilter
+            return DateTimeRangeFilter
+        except ImportError:
+            pass
+
+    return DateFieldListFilter