import calendar


def get_month_week_number(day):
    """
    Given a datetime object (day), return the number of week the day is
    in the current month (week 1, 2, 3, etc)
    """
    weeks = calendar.monthcalendar(day.year, day.month)
    for week in weeks:
        if day.day in week:
            return weeks.index(week)