set tt=%date:~0,4%%date:~5,2%%date:~8,2%
mkdir D:SVN_BACKUP_%tt%Repositories
xcopy C:Repositories D:SVN_BACKUP_%tt%Repositories /e /y /h
tt:为获取当前的系统时间格式为:20180301
set tt=%date:~0,4%%date:~5,2%%date:~8,2%
mkdir D:SVN_BACKUP_%tt%Repositories
xcopy C:Repositories D:SVN_BACKUP_%tt%Repositories /e /y /h
tt:为获取当前的系统时间格式为:20180301