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【Java】获取同环比时间

作者:蜗牛在路上 / 发布于2014/12/19/ 593

根据指定起止日期，获得同环比的带比较日期，默认日期格式：“2014-12-14”。


	/**
	* 获得环比的待比较时间范围，逗号分隔，返回待环比日期
	* @param startDate 如："2014-01-01"，默认是一个月的第一天
	* @param endDate 如："2014-06-30"，默认与startDate在同一年
	* @return
	* @author Euray
	*/
	public static String getHuanBiDate(String startDate, String endDate) {
	 String[] starts = startDate.split("-");
	 String[] ends = endDate.split("-");
	 int startYear = Integer.parseInt(starts[0]);
	 int startMonth = Integer.parseInt(starts[1]);
	 int endMonth = Integer.parseInt(ends[1]);
	 int endDay = Integer.parseInt(ends[2]);
	 Calendar end = Calendar.getInstance();
	 end.set(startYear, endMonth - 1, 1);
	 int days = end.getActualMaximum(Calendar.DAY_OF_MONTH);
	 String returnDate = "";
	 int subNum = endMonth - startMonth + 1;//当前选择了几个月
	 if (startMonth > subNum) { //待环比日期在同一年，还是不同一年
	 int startMonthH = startMonth - subNum;
	 int endMonthH = startMonth - 1;
	 Calendar endH = Calendar.getInstance();
	 endH.set(startYear, endMonthH - 1, 1);
	 int daysH = endH.getActualMaximum(Calendar.DAY_OF_MONTH);
	 returnDate = startYear + (startMonthH < 10 ? "-0" : "-") + startMonthH + "-01," + startYear
	 + (endMonthH < 10 ? "-0" : "-") + endMonthH + "-" + (endDay < days ? ends[2] : daysH);
	 } else {
	 int startMonthH = 12 + startMonth - subNum;
	 if (startMonth > 1) {
	 int endMonthH = startMonth - 1;
	 Calendar endH = Calendar.getInstance();
	 endH.set(startYear, endMonthH - 1, 1);
	 int daysH = endH.getActualMaximum(Calendar.DAY_OF_MONTH);
	 returnDate = (startYear - 1) + (startMonthH < 10 ? "-0" : "-") + startMonthH + "-01," + startYear
	 + (endMonthH < 10 ? "-0" : "-") + endMonthH + "-" + (endDay < days ? ends[2] : daysH);
	 } else {
	 returnDate = (startYear - 1) + (startMonthH < 10 ? "-0" : "-") + startMonthH + "-01," + (startYear - 1)
	 + "-12-" + (endDay < 31 ? ends[2] : 31);
	 }
	 }
	 return returnDate;
	}
	
	/**
	* 获得同比的待比较时间范围，逗号分隔，返回待同比日期
	* @param startDate 如："2014-01-01"，默认是一个月的第一天
	* @param endDate 如："2014-06-30"，默认与startDate在同一年
	* @return
	* @author Euray
	*/
	public static String getTongBiDate(String startDate, String endDate) {
	 String[] starts = startDate.split("-");
	 String[] ends = endDate.split("-");
	 int startYear = Integer.parseInt(starts[0]);
	 int endMonth = Integer.parseInt(ends[1]);
	 int endDay = Integer.parseInt(ends[2]);
	 Calendar endDateT = Calendar.getInstance();
	 endDateT.set(startYear - 1, endMonth - 1, 1);
	 int days = endDateT.getActualMaximum(Calendar.DAY_OF_MONTH);
	 String returnDate = "";
	 if (endDay < days) {
	 returnDate = (startYear - 1) + "-" + starts[1] + "-01," + (startYear - 1) + "-" + ends[1] + "-" + ends[2];
	 } else {
	 returnDate = (startYear - 1) + "-" + starts[1] + "-01," + (startYear - 1) + "-" + ends[1] + "-" + days;
	 }
	 return returnDate;
	}

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