Batch file 用当前日期重命名文件的批处理脚本

我试图简单地重命名一个文件，用当前日期替换文件名中的日期。我得到“语法不正确错误”

这是我的密码：

echo on
for /f "skip=1" %%x in ('wmic os get localdatetime') do if not defined MyDate set MyDate=%%x
set today=%MyDate:~0,4%-%MyDate:~4,2%-%MyDate:~6,2%


set "_year=%MyDate:~0,4%"
set "_month=%MyDate:~4,2%"
set "_day=%MyDate:~6,2%"

REN C:\Users\xyz125\Documents\Erics's Docs\scripts\"test file (20150112).txt" "test file (%_year%%_month%%_day%).txt"

pause

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错误引用：代替

REN C:\Users\xyz125\Documents\Erics's Docs\scripts\"test file (20150112).txt" "test file (%_year%%_month%%_day%).txt"
rem                                                ^

应该是

REN "C:\Users\xyz125\Documents\Erics's Docs\scripts\test file (20150112).txt" "test file (%_year%%_month%%_day%).txt"
rem ^

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工作起来很有魅力。谢谢