在服务器端，如何仅根据年份和周数来计算周开始日期？

import datetime

def calculate_week_start_date(year, week):
    # 获取当前日期和时间
    now = datetime.datetime.now()
    
    # 获取当前日期所在的年份和周数
    current_year = now.year
    current_week = now.isocalendar()[1]
    
    # 如果给定的年份和周数与当前日期相同，则直接返回当前日期
    if year == current_year and week == current_week:
        return now.date()
    
    # 计算给定年份的第一天是星期几
    first_day = datetime.date(year, 1, 1)
    first_day_weekday = first_day.isoweekday()
    
    # 计算给定周数的开始日期
    days_to_add = (week - 1) * 7 - first_day_weekday + 1
    week_start_date = first_day + datetime.timedelta(days=days_to_add)
    
    return week_start_date

# 示例用法
year = 2022
week = 10
start_date = calculate_week_start_date(year, week)
print(start_date)