bat 批处理－取年、月、日、时、分、秒、毫秒 
取年份：echo %date:~0,4% 
取月份：echo %date:~5,2% 
取日期：echo %date:~8,2% 
取星期：echo %date:~10,6% 
取小时：echo %time:~0,2% 
取分钟：echo %time:~3,2% 
取秒：echo %time:~6,2% 
取毫秒：echo %time:~9,2%