set h=%time:~0,2%
set h=%h: =0%
set bak_filename=%date:~0,4%%date:~5,2%%date:~8,2%%h%%time:~3,2%%time:~6,2% set bak_f
set h=%h: =0%
set bak_filename=%date:~0,4%%date:~5,2%%date:~8,2%%h%%time:~3,2%%time:~6,2% set bak_f
阅读背景：
bat 获取系统时间，并去掉时间小时前面的空格
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