set currentDate=%date:/=_% set currentDate=%currentDate:~0,10% set currentTime=%time:~0,5% set currentTime=%currentTime: =0% set currentTime=%currentDate%_%currentTime::=% echo %currentTime% # 2020_08_03_1630
批处理不能在一行内对字符串作出多个操作,所以不能又替换又截取
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