Adjust the number of times an annual offset is applied based on
    another date, and the reference day provided

def _adjust_n_years(other, n, month, reference_day):
    """Adjust the number of times an annual offset is applied based on
    another date, and the reference day provided"""
    if n > 0:
        if other.month < month or (other.month == month and
                                   other.day < reference_day):
            n -= 1
    else:
        if other.month > month or (other.month == month and
                                   other.day > reference_day):
            n += 1
    return n