from datetime import datetime, timedelta

def hours_until_5_20():
    now = datetime.now()
    target_time = datetime(now.year, now.month, now.day, 17, 20)  # 设置目标时间为当天的17:20
    
    #if now > target_time:  # 如果当前时间已经过了今天的目标时间
    #    target_time += timedelta(days=1)  # 将目标时间设置为明天的同一时间
    
    time_difference = now -target_time
    hours_difference = time_difference.total_seconds() / 3600  # 将时间差转换为小时
    return hours_difference

# 调用函数并打印结果
print("Time until 5:20 is: {0:.2f} h".format(hours_until_5_20()))