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System.out.println(cal.get(Calendar.YEAR)+" - "+cal.get(Calendar.MONTH)+" - "+cal.get(Calendar.DAY_OF_MONTH));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cal = Calendar.getInstance();
//最近三天
cal.add(Calendar.DAY_OF_YEAR, -3);
//最近一周
cal.add(Calendar.WEEK_OF_YEAR, -1);
//最近两周
cal.add(Calendar.WEEK_OF_YEAR, -2);
//最近一个月
cal.add(Calendar.MONTH, -1);
//最近两个月
cal.add(Calendar.MONTH, -2);
Date d = cal.getTime();
System.out.println(sdf.format(d));