def get_month_start(day=None):
    day = add_timezone(day or datetime.date.today())
    return day.replace(day=1)
Testing commit reads
dataset/ETHPy150Open caktus/django-timepiece/timepiece/utils/__init__.py/get_month_start--crossover with--dataset/ETHPy150Open EricssonResearch/calvin-base/calvin/tests/test_fifo.py/FifoTests.test3