实现出生日期计算岁，月，天代码,CSharp代码库,德仔网

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【CSharp】实现出生日期计算岁，月，天

作者:Dezai.CN / 发布于2013/6/8/ 529


	/// 通过生日和当前日期计算岁，月，天
	 /// </summary>
	 /// <param name="birthday">生日</param>
	 /// <param name="now">当前日期</param>
	 /// <param name="year">岁</param>
	 /// <param name="month">月</param>
	 /// <param name="day">天</param>
	 private void GetAgeByBirthday(DateTime birthday, DateTime now,out int year,out int month,
	 out int day)
	 {
	 //生日的年，月，日
	 int birthdayYear = birthday.Year;
	 int birthdayMonth = birthday.Month;
	 int birthdayDay = birthday.Day;
	
	 //当前时间的年,月,日
	
	 int nowYear = now.Year;
	 int nowMonth = now.Month;
	 int nowDay = now.Day;
	
	 //得到天
	 if (nowDay >= birthdayDay)
	 {
	 day = nowDay - birthdayDay;
	 }
	 else
	 {
	 nowMonth -= 1;
	 day = GetDay(nowMonth, nowYear) + nowDay - birthdayDay;
	 }
	
	 //得到月
	 if (nowMonth >= birthdayMonth)
	 {
	 month = nowMonth - birthdayMonth;
	 }
	 else
	 {
	 nowYear -= 1;
	 month = 12 + nowMonth - birthdayMonth;
	 }
	
	 //得到年
	 year = nowYear - birthdayYear;
	 }
	
	 /// <summary>
	 /// 获取天数
	 /// </summary>
	 private int GetDay(int month, int year)
	 {
	 int day = 0;
	 switch (month)
	 {
	 case 1:
	 case 3:
	 case 5:
	 case 7:
	 case 8:
	 case 10:
	 case 12:
	 day = 31;
	 break;
	 case 2:
	 //闰年天，平年天
	 if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
	 {
	 day = 29;
	 }
	 else
	 {
	 day = 28;
	 }
	 break;
	 case 4:
	 case 6:
	 case 9:
	 case 11:
	 day = 30;
	 break;
	 }
	 return day;
	 }

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