updated whoosh backend to utilize datetime from the standard library (#…

…1937)

Co-authored-by: me <me@gmail.com>

haystack/backends/whoosh_backend.py

@@ -4,10 +4,10 @@
 import shutil
 import threading
 import warnings
+from datetime import date, datetime
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
-from django.utils.datetime_safe import date, datetime
 from django.utils.encoding import force_str
 
 from haystack.backends import (

test_haystack/whoosh_tests/test_whoosh_backend.py

@@ -1,12 +1,11 @@
 import os
 import unittest
-from datetime import timedelta
+from datetime import date, datetime, timedelta
 from decimal import Decimal
 
 from django.conf import settings
 from django.test import TestCase
 from django.test.utils import override_settings
-from django.utils.datetime_safe import date, datetime
 from whoosh.analysis import SpaceSeparatedTokenizer, SubstitutionFilter
 from whoosh.fields import BOOLEAN, DATETIME, KEYWORD, NUMERIC, TEXT
 from whoosh.qparser import QueryParser