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

偏执的太偏执、 2023-10-06 13:59 31阅读 0赞

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);