Tests fail on 31st of a month

[mweinelt]

Not every month has 31 days. Tests ran v1.1.0.

____________________ ERROR collecting tests/test_search.py _____________________
/build/source/tests/test_search.py:12: in <module>
    class TestTranslateSearch(BaseTestCase):
/build/source/tests/test_search.py:471: in TestTranslateSearch
    ('June 2020', datetime.datetime(2020, 6, datetime.datetime.utcnow().day, 0, 0)),
E   ValueError: day is out of range for month
____________________ ERROR collecting tests/test_search.py _____________________
/build/source/tests/test_search.py:12: in <module>
    class TestTranslateSearch(BaseTestCase):
/build/source/tests/test_search.py:471: in TestTranslateSearch
    ('June 2020', datetime.datetime(2020, 6, datetime.datetime.utcnow().day, 0, 0)),
E   ValueError: day is out of range for month
=========================== short test summary info ============================
ERROR tests/test_search.py - ValueError: day is out of range for month
ERROR tests/test_search.py - ValueError: day is out of range for month
!!!!!!!!!!!!!!!!!!! Interrupted: 2 errors during collection !!!!!!!!!!!!!!!!!!!!
======================= 2 deselected, 2 errors in 3.96s ========================