Java8使用LocalDate计算日期实例代码解析

public static String getTerm(String startTime, String endTime) {
	String term = "";
	if (startTime.length() != 8 || endTime.length() != 8) {
		return startTime + "-" + endTime;
	}
	try {
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");
		LocalDate startDate = LocalDate.parse(startTime, formatter);
		LocalDate endDate = LocalDate.parse(endTime, formatter);
		int start_month = startDate.getMonthValue();	//开始日期月份
		int start_day = startDate.getDayOfMonth();		//开始日期天数
		int end_year = endDate.getYear();				//结束日期年份
		int end_month = endDate.getMonthValue();		//结束日期月份
		int end_day = endDate.getDayOfMonth();			//结束日期天数

		long y = ChronoUnit.YEARS.between(startDate, endDate);		//计算两个日期间的年
		long m = ChronoUnit.MONTHS.between(startDate, endDate);		//计算两个日期间的月
		long d = ChronoUnit.DAYS.between(startDate, endDate);		//计算两个日期间的天

		int lastDayOfEndDate = endDate.with(TemporalAdjusters.lastDayOfMonth()).getDayOfMonth();//获取日期月份的最后一天
		if (start_day == end_day || lastDayOfEndDate == end_day) {
			m = end_month - start_month;
			d = 0;
		} else if (end_day > start_day) {
			d = endDate.getDayOfMonth() - startDate.getDayOfMonth();
		} else {
			String tmpY = "";
			String tmpM = "";
			String tmpD = "";
			if(end_month == 1) {
				tmpY = String.valueOf(end_year-1);
				tmpM = String.valueOf(12);
				tmpD = String.valueOf(start_day);
			}else {
				tmpY = String.valueOf(end_year);
				if (end_month < 10) {
					tmpM = "0" + (end_month - 1);
				} else {
					tmpM = String.valueOf(end_month - 1);
				}
				tmpD = String.valueOf(start_day);
			}
			String tmpTime = tmpY + tmpM + tmpD;
			LocalDate tmpDate = LocalDate.parse(tmpTime, formatter);
			d = ChronoUnit.DAYS.between(tmpDate, endDate);
		}
		if (m >= 12) {
			m = m - y * 12;
		}
		term = (y == 0 ? "" : y + "年") + (m == 0 ? "" : +m + "个月") + (d == 0 ? "" : d + "天");
	} catch (Exception e) {
		term = startTime + "-" + endTime;
		e.printStackTrace();
	}
	return term;
}