java 获取当前时间往前推n分钟时间的方法

获取当前时间

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date now = new Date();
            System.out.println("当前时间：" + sdf.format(now));

获取当前时间往前推n分钟的方法

Calendar beforeTime = Calendar.getInstance();
        
                beforeTime.add(Calendar.MINUTE, -n);
                 beforeD = beforeTime.getTime();
                System.out.println("往后推"+n+"分钟时间："+sdf.format(beforeD) );

获取当前时间几个月前时间

 Calendar beforeTime = Calendar.getInstance();

        beforeTime.add(Calendar.MONTH, -2);
        Date beforeD = beforeTime.getTime();
        System.out.println("往前推3个月时间："+sdf.format(beforeD) );