上代码：
public static List<CycleTimeVo> getMonthBetween(String minDate, String maxDate) throws Exception { // ArrayList<String> result = new ArrayList<String>(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");//格式化为年月 Calendar min = Calendar.getInstance(); Calendar max = Calendar.getInstance(); min.setTime(sdf.parse(minDate)); min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1); max.setTime(sdf.parse(maxDate)); max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2); Calendar curr = min; List<CycleTimeVo> CycleTimeList=new ArrayList(); while (curr.before(max)) { CycleTimeVo cycleTimeVo=new CycleTimeVo(); cycleTimeVo.setStartTimeStr(sdf.format(curr.getTime())); String monthEnd = getMonthEnd(sdf.format(curr.getTime())); cycleTimeVo.setEndTimeStr(monthEnd); CycleTimeList.add(cycleTimeVo); //result.add(sdf.format(curr.getTime())); curr.add(Calendar.MONTH, 1); } return CycleTimeList; } public static String getMonthEnd(String time) throws ParseException { SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd"); Date date= simpleDateFormat.parse(time); Calendar c = Calendar.getInstance(); c.setTime(date); //设置为当月最后一天 c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH)); //将小时至23 c.set(Calendar.HOUR_OF_DAY, 23); //将分钟至59 c.set(Calendar.MINUTE, 59); //将秒至59 c.set(Calendar.SECOND,59); //将毫秒至999 c.set(Calendar.MILLISECOND, 999); // 获取本月最后一天的时间 return simpleDateFormat.format(c.getTime()); }
测试结果：
List<CycleTimeVo> monthBetween = getMonthBetween("2019-01-01", "2020-06-03"); System.out.println(monthBetween);
可以看到每个月的开始日期可结束日期都获取到了：
PS： 如果是要算出两个日期之间的月数，则只需要对最后的list取其size 即可。
