java获取当前时间前一周、前一月、前一年的时间

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);