日期管理小工具，可以执行以下操作：

选择1：查看X年日历

选择2：查看X年X月日历

选择3：查看X年X月X日对应星期

选择4：计算两日期间的天数差

选择5：计算指定日期后X天的日期

选择6：查看系统时间

选择7：清屏并继续

选择8：退出-Date management gadget, you can do the following:

Option 1: View X calendar

Option 2: View X X month calendar

Option 3: View X X X month corresponding week day

Option 4: Calculate the difference between the number of days between two dates

Select 5: X days after the calculation date specified date

Select 6: Check the system time

Select 7: clear the screen and continue

Select 8: Exit