这个方法只能精确到秒
@echo off
echo wscript.echo DateDiff("s", "01/01/1970 00:00:00", Now())>sjc.vbs
for /f %%i in ('cscript sjc.vbs /nologo') do set x=%%i
copy dianying.wmv d:\back
for /f %%i in ('cscript sjc.vbs /nologo') do set y=%%i
set /a z=y-x
echo 复制文件用时%z%秒
del sjc.vbs
pause
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