def get_monthly_report_subject(month_day, person):
    """
    Returns subject string for monthly report email

    `month_day:datetime.date` - any date for the month we are reporting for
    `person:str` - reporting person's name, e.g. 'Jon Doe'
    """
    calendar_time = '{year}/{month:02}'.format(year=month_day.year, month=
        month_day.month)
    subject = 'Monthly report for {person} ({calendar_time})'.format(person
        =person, calendar_time=calendar_time)
    return subject
