用批处理实现文件备份器V2.3

echo           ╭─────────┤  日期输入错误  ├─────────╮
echo           │                  ╰────────╯                  │
echo           │                                                        │
echo           │                   您的日期输入有错误                   │
echo           │                                                        │
echo           │                                                        │
echo           │        1. 日期不能字母和数字混用；                     │
echo           │                                                        │
echo           │        2. 单个的数字式日期不能大于31，个数不能超过     │
echo           │                                                        │