如何在C＃中将字符串转换为日期时间格式 [英] How to convert string to date time format in C#

问题描述

我有一个像下面的字符串，我正在转换为日期时间格式。我尝试过以下方式。有没有其他方法可以做到这一点。格式化后字符串的预期结果应该像yyyy-MM-dd hh：mm：ss ms。



我尝试了什么： < br $>


StringBuilder myStringBuilder = new StringBuilder（20180215031530000）;

myStringBuilder = myStringBuilder.Insert（4， - ）;

myStringBuilder = myStringBuilder.Insert（7， - ）;

myStringBuilder = myStringBuilder.Insert（10，）;

myStringBuilder = myStringBuilder。插入（13，：）;

myStringBuilder = myStringBuilder.Insert（16，：）;

myStringBuilder = myStringBuilder.Insert（19，。） ;

DateTime dt = Convert.ToDateTime（myStringBuilder.ToString（））;

Hi,

I have a string like below which is I am converting to datetime format. I tried in below way. Is there any other way to do it. Expected outcome of string after formatting should be like yyyy-MM-dd hh:mm:ss ms.

What I have tried:

StringBuilder myStringBuilder = new StringBuilder("20180215031530000");
myStringBuilder = myStringBuilder.Insert(4, "-");
myStringBuilder = myStringBuilder.Insert(7, "-");
myStringBuilder = myStringBuilder.Insert(10, " ");
myStringBuilder = myStringBuilder.Insert(13, ":");
myStringBuilder = myStringBuilder.Insert(16, ":");
myStringBuilder = myStringBuilder.Insert(19, ".");
DateTime dt = Convert.ToDateTime(myStringBuilder.ToString());

推荐答案

参见DateTime.TryParse Method（System）| Microsoft Docs [ ^ ]以获得更好的方法。

See DateTime.TryParse Method (System) | Microsoft Docs[^] for a better method.

除了解决方案1的具体示例：

In addition to solution 1 a concrete example:

var originalTimeString = "20180215031530000";

DateTime dt;

var success = DateTime.TryParseExact(originalTimeString, "yyyyMMddhhmmssfff", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt);

if (success)
{
    var newTimeString = dt.ToString("yyyy-MM-dd hh:mm:ss fff");
}

尽管如此，请阅读建议的文档。

Nevertheless please read the suggested documentation.

不要这样做。

使用 DateTime.TryParseExact [< a href =https://docs.microsoft.com/en-us/dotnet/api/system.datetime.tryparseexact?view=netframework-4.7.2\"target =_ blanktitle =New Window> ^ ]而不是插入分隔符：

Don't do that.
Use DateTime.TryParseExact[^] instead of inserting delimiters:

string input = "20180215031530000";
DateTime dt;
if (!DateTime.TryParseExact(input, "yyyyMMddHHmmssfff", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt))
    {
    Console.WriteLine("Problem with input date");
    return;
    }
Console.WriteLine(dt);

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