如何在asp.net中将年份转换为日期 [英] How to Convert Years to Day in asp .net

问题描述

我想转换年份i：5年到包括闰年的天数

I want to convert years i:e 5 years to how many days including leap year

推荐答案

问题是你不能这样做：5年可能包括一年，两年或零闰年，具体取决于它们所涵盖的具体年份（闰年计算的更正意味着我们每个世纪都会跳过闰日，除非它也是千禧年结束）



如果您知道开始年份（或最好是开始日期），您可以轻松获得天数：

The problem is that you can't do that: 5 years may include one, two, or zero leap years depending on the specific years that they cover (there are corrections to leap year calculations which mean we skip a leap day every century, unless it's a millennium end as well)

If you know the start year (or preferably the start date) you can easily get the number of days:

DateTime start = new DateTime(2001,1,1);
DateTime end = start.AddYears(5);
int days = (end - start).Days;

这是想法：使用以下构造函数获取两个日期，第一个和最后一个： https： //msdn.microsoft.com/en-us/library/xcfzdy4x%28v=vs.110%29.aspx 。



然后减去最后一个首先使用' - '运算符。此运算符返回 System.TimeSpan 类型的对象：

https://msdn.microsoft.com/en-us/library/system.timespan%28v=vs.110%29.aspx 。



现在，您只需要以天为单位表示时间跨度。例如： https://msdn.microsoft.com /en-us/library/system.timespan.days%28v=vs.110%29.aspx 。



这就是全部。选择日期时要仔细考虑;犯1天的错误很容易。如您所见，整个代码只有3行左右。

-SA

Here is the idea: take two dates, first and last, using this constructor: https://msdn.microsoft.com/en-us/library/xcfzdy4x%28v=vs.110%29.aspx.

Then subtract last from first using '-' operator. This operator returns the object of the type System.TimeSpan:
https://msdn.microsoft.com/en-us/library/system.timespan%28v=vs.110%29.aspx.

Now, you just need to express the time span in days. For example: https://msdn.microsoft.com/en-us/library/system.timespan.days%28v=vs.110%29.aspx.

That's all. Think carefully when you choose the dates; it's quite easy to make a mistake of 1 day. As you can see, the whole code will be just 3 lines or so.

—SA

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