获取当前时间前一个月

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
Calendar c = Calendar.getInstance();

    //过去七天
    c.setTime(new Date());
    c.add(Calendar.DATE, - 7);
    Date d = c.getTime();
    String day = format.format(d);
    System.out.println("过去七天："+day);
     
    //过去一月
    c.setTime(new Date());
    c.add(Calendar.MONTH, -1);
    Date m = c.getTime();
    String mon = format.format(m);
    System.out.println("过去一个月："+mon);
     
    //过去三个月
    c.setTime(new Date());
    c.add(Calendar.MONTH, -3);
    Date m3 = c.getTime();
    String mon3 = format.format(m3);
    System.out.println("过去三个月："+mon3);
     
    //过去一年
    c.setTime(new Date());
    c.add(Calendar.YEAR, -1);
    Date y = c.getTime();
    String year = format.format(y);
    System.out.println("过去一年："+year);