我想通过.bat批处理文件修改系统时间，然后再恢复当前时间，现在能改但是恢复不了，求教大佬是哪里的问题
@璐村惂鐢ㄦ埛_000076K馃惥 off
%1 mshta vbscript:CreateObject("Shell.Application").ShellExecute("cmd.exe","/c %~s0 ::","","runas",1)(window.close)&&exit
cd /d "%~dp0"
set a=%date%
date 2017-1-30
ping -n 30 127.0>nul
date %a%
@璐村惂鐢ㄦ埛_000076K馃惥 off
%1 mshta vbscript:CreateObject("Shell.Application").ShellExecute("cmd.exe","/c %~s0 ::","","runas",1)(window.close)&&exit
cd /d "%~dp0"
set a=%date%
date 2017-1-30
ping -n 30 127.0>nul
date %a%
