• 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