VBS定时关机

Dim mytime,myout1,myout2
mytime=null
mytime=InputBox("请输入定时时间(格式20：10：05)"&vblf&"如果想倒计时关机，请输入倒计时时间"&vblf&"(单位/分钟)"&vblf&"输入‘xxx’可以马上关机"&vblf&"退出点‘取消’","定时关机","1")
Set wshshell=wscript.createobject("wscript.shell")
If IsNumeric(mytime)=False Then
If IsDate(mytime)=True Then
wshshell.run "at "&mytime&" shutdown -s" '定时关机在任务列表中
myout1=MsgBox("定时成功！电脑将在"&mytime&"关机！放弃关机请点‘取消’！",vbokcancel,"定时关机")
If myout1=vbcancel Then
wshshell.run "at /delete /y"
MsgBox "关机已取消！",64,"定时关机"
End If
Else
If mytime="xxx" Then
wshshell.run "shutdown -s -t 0"
End If
MsgBox "输入错误！请重新输入！",64,"定时关机"
End If
Else
If mytime>600 Or mytime<=0 Then
MsgBox "输入错误！倒计时不能多于10小时(600分钟)！",64,"定时关机"
wscript.quit
End If
wshshell.run "shutdown -s -t "&mytime*60
myout2=MsgBox("设置成功！电脑将在"&mytime&"分钟后关机！放弃关机请点‘取消’！",vbokcancel,"定时关机")
If myout2=vbcancel Then
wshshell.run "shutdown -a"
MsgBox "关机已取消！",64,"定时关机"
End If
End If