Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, -1);
System.out.println("上个月是:"+new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()));
Calendar c = Calendar.getInstance();
c.add(Calendar.WEEK_OF_MONTH, -1);
System.out.println("上周是:"+new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()));
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