Java实现获取某个时间段的工具类:如过去一周,一个月,一年等日期

给大家分享获取某个时间段的工具类,需要的可以copy使用

  
        //1. 过去七天
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar c = Calendar.getInstance();
        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);
        
        
        //2. 过去一月
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar c = Calendar.getInstance();
        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);
        
        
        // 3. 过去三个月
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar c = Calendar.getInstance();
        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);
        
        
        //4. 过去一年
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar c = Calendar.getInstance();
        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);
        
        
        // 5. 现在时间24小时制
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String nowDate = format.format(new Date());
        System.out.println(nowDate);
        
        
        // 6. 当天的开始时间
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        String start = format.format(c.getTime()) + " 00:00:00";
        System.out.println(start);
        
        
        // 7. 当天的截止时间
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();
        String end = format.format(calendar.getTime()) + " 23:59:59";
        System.out.println(end);
        
        
        // 8. 当前时间的前一个星期 开始时间
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.add(Calendar.DAY_OF_MONTH, -6);
        String start = format.format(c.getTime()) + " 00:00:00";
        System.out.println(start);
        
        
        // 9. 当天日期前一个月
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.add(Calendar.MONTH, -1);    //得到前一个月    
        String start = format.format(c.getTime()) + " 00:00:00";
        System.out.println(start);
        
        
        // 10. 当前时间的前一年开始时间
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.add(Calendar.YEAR, -1); //年份减1   
        String start = format.format(c.getTime()) + " 00:00:00";
        System.out.println(start);
        
        
        // 11. 当前时间的周一时间和周末时间 setfirstdayofweek()方法
        SimpleDateFormat format = new SimpleDateFormat("YYYY-MM-dd ");
        Calendar c = Calendar.getInstance();
        c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        String weekStart = format.format(c.getTime()) + " 00:00:00";
        System.out.println(weekStart);
        Calendar ca = Calendar.getInstance();
        ca.setFirstDayOfWeek(Calendar.MONDAY);
        ca.set(Calendar.DAY_OF_WEEK, ca.getFirstDayOfWeek() + 6); // Sunday  
        String weekEnd = format.format(ca.getTime()) + " 23:59:59";
        System.out.println(weekEnd);
        
        
        // 12. 当前时所在月份的第一天和最后一天
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.set(Calendar.DAY_OF_MONTH, 1);//设置为1号,当前日期既为本月第一天   
        String monthStart = format.format(c.getTime()) + " 00:00:00";
        System.out.println(monthStart);
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));
        String monthEnd = format.format(ca.getTime()) + " 23:59:59";
        System.out.println(monthEnd);
        
        
        // 13. 当期时间所在年份的开始时间
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.set(c.get(Calendar.YEAR), 0, 1);//开始时间日期  
        String yearStart = format.format(c.getTime()) + " 00:00:00";
        System.out.println(yearStart);
        Calendar ca = Calendar.getInstance();
        ca.set(ca.get(Calendar.YEAR), 11, ca.getActualMaximum(Calendar.DAY_OF_MONTH));//结束日期  
        String yearEnd = format.format(ca.getTime()) + " 23:59:59";
        System.out.println(yearEnd);

        
        // 14. 获取某个时间的上周一和周日
        Calendar cal = Calendar.getInstance();
        //n为推迟的周数,1本周,-1向前推迟一周,2下周,依次类推
        int n = 1;
        String monday;
        cal.add(Calendar.DATE, n * 7);
        //想周几,这里就传几Calendar.MONDAY(TUESDAY...)
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        monday = new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
        System.out.println(monday);

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