shell pip install freezegun python from datetime import datetime from freezegun import freeze_time python @freeze_time("2022-01-01") def test_function(): current_time = datetime.now() test_function() python @freeze_time("2022-01-01") def test_function(): current_time = datetime.now() with freeze_time("2022-02-01") as frozen_datetime: frozen_datetime.tick(days=10) new_time = datetime.now() test_function() python @freeze_time("2022-01-01", tz_offset=+8) def test_function(): current_time = datetime.now() test_function()