package org.springblade.common.constant;

import java.util.Calendar;

public class AgeUtil {

	/**
	 * 根据身份证计算年龄
	 *
	 * @param idcard
	 * @return
	 */
	public static Integer idCardToAge(String idcard) {

		if (idcard.length() != 15 && idcard.length() != 18){
			return null;
		}

		//身份证日期截取
		Integer selectYear = Integer.valueOf(idcard.substring(6, 10));         //出生的年份
		Integer selectMonth = Integer.valueOf(idcard.substring(10, 12));       //出生的月份
		Integer selectDay = Integer.valueOf(idcard.substring(12, 14));         //出生的日期
		//当前时间
		Calendar cal = Calendar.getInstance();
		Integer yearMinus = cal.get(Calendar.YEAR) - selectYear;
		Integer monthMinus = cal.get(Calendar.MONTH) + 1 - selectMonth;
		Integer dayMinus = cal.get(Calendar.DATE) - selectDay;
		Integer age = yearMinus;
		if (yearMinus < 0) {
			age = 0;
		} else if (yearMinus == 0) {
			age = 0;
		} else if (yearMinus > 0) {
			if (monthMinus == 0) {
				if (dayMinus < 0) {
					age = age - 1;
				}
			} else if (monthMinus > 0) {
				age = age + 1;
			}
		}
		return age;
	}
}