将DateTime转换为字符串“yyyy-mm-dd” [英] Convert DateTime to string "yyyy-mm-dd"

问题描述

我想知道如何将DateTime转换为字符串值（yyyy-mm-dd）。我有一个控制台应用程序，我希望用户能够写一个日期为yyyy-mm-dd，然后转换为字符串。

Im wondering how to convert a DateTime to a string value (yyyy-mm-dd). I have a console application and i want the user to be able to write a Date as "yyyy-mm-dd" which are then converted as a string.

我有尝试了这个，但它似乎在相反的方向工作。这个想法是用户通过Console.ReadLine输入开始日期和结束日期。然后，这些值作为字符串存储在字符串A和B中，然后可以稍后使用。这是可能吗？

I have tried this but it works in oposite direction it seem. The idea is that the user enters a Start date and an End date with Console.ReadLine. Then these values are stored as strings in string A and B wich could then be used later. Is that possible?

string A = string.Empty;
string B = string.Empty;
DateTime Start = DateTime.ParseExact(A, "yyyy-mm-dd",CultureInfo.InvariantCulture);
Console.WriteLine("Enter StartDate! (yyyy-mm-dd)");
Start = Console.ReadLine();      
DateTime End = DateTime.ParseExact(A, "yyyy-mm-dd",CultureInfo.InvariantCulture);
Console.WriteLine("Enter EndDate! (yyyy-mm-dd)");
End = Console.ReadLine();

谢谢

推荐答案

你在正确的轨道上，但你有点偏离。例如，在阅读时尝试这样的事情：

You're on the right track but you're a little off. For example try something like this when reading in:

var s = Console.ReadLine();
var date = DateTime.ParseExact(s,"yyyy-MM-dd",CultureInfo.InvariantCulture);

您可能需要使用 DateTime.TryParseExact（）以及它有点安全，你可以处理当有人输入垃圾时会发生什么。现在你会得到一个很好的例外。

You might want to use DateTime.TryParseExact() as well, it's a bit safer and you can handle what happens when someone types garbage in. As it stands you'll get a nice exception currently.

当输出以特定格式，您可以使用与 DateTime.ToString（）相同的格式，例如：

When outputting to a specific format you can use the same format with DateTime.ToString(), for example:

var date_string = date.ToString("yyyy-MM-dd");

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