如何从一年中的某一天获取日期

Question

如何在C＃中从date获取day of year？

我有这段代码：

int a = 53;   // This is the day of year value, that I got previously
string b = Convert.ToDateTime(a).ToString();   // Trying to get the date

我需要获得值22.2.2014。但这不起作用，我该怎么办？提前谢谢。

Answer 1

int a = 53;
int year = DateTime.Now.Year; //Or any year you want
DateTime theDate = new DateTime(year, 1, 1).AddDays(a - 1);
string b = theDate.ToString("d.M.yyyy");   // The date in requested format

Answer 2

假设你想要当年？

int a = 53;
DateTime date = new DateTime(DateTime.Now.Year, 1,1).AddDays(a -1);

Answer 3

int a = 53;
var dt = new DateTime(DateTime.Now.Year, 1, 1).AddDays(a - 1);
string b = dt.ToString();

Answer 4

使用

DateTime.AddDays()

将日期初始化为年初，然后使用此功能将a添加到该日期

http://msdn.microsoft.com/en-us/library/system.datetime.adddays(v=vs.110).aspx