计算剩余生日的日子吗？ [英] Calculate days remaining to a birthday?

问题描述

我有一个人的生日DateTime对象。我使用人的年，月，出生日期，按以下方式创建该对象：

 日期时间日期=新的日期时间（年，月，日）; 
  

我想知道多少天是怎么这个人的下一个生日前的剩余。是什么在C＃中这样做（我是新来的语言）？

解决方案

 <$的最好方式C $ C> //生日是包含生日
 
日期时间今天= DateTime.Today日期时间; 
的DateTime下次=新日期时间（today.Year，birthday.Month，birthday.Day）; 
 
如果（下一个<今天）
下一= next.AddYears（1）; 
 
 INT NUMDAYS =（下一个 - 今）.Days; 
  

如果生日是2月29日这个平凡的算法失败。这是替代（其基本上与由勒布Nilsson的答案：

 今天日期时间= DateTime.Today; 
的DateTime下次= birthday.AddYears（today.Year  -  birthday.Year）; 
 
如果（下一个<今天）
下一= next.AddYears（1）; 
 
 INT NUMDAYS =（下一个 - 今）.Days; 
  

I have a DateTime object with a person's birthday. I created this object using the person's year, month and day of birth, in the following way:

DateTime date = new DateTime(year, month, day);

I would like to know how many days are remaining before this person's next birthday. What is the best way to do so in C# (I'm new to the language)?

解决方案

// birthday is a DateTime containing the birthday

DateTime today = DateTime.Today;
DateTime next = new DateTime(today.Year,birthday.Month,birthday.Day);

if (next < today)
    next = next.AddYears(1);

int numDays = (next - today).Days;

This trivial algorithm fails if the birthday is Feb 29th. This is the alternative (which is essentially the same as the answer by Seb Nilsson:

DateTime today = DateTime.Today;
DateTime next = birthday.AddYears(today.Year - birthday.Year);

if (next < today)
    next = next.AddYears(1);

int numDays = (next - today).Days;

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