需要仅使用日期更改日期时间 [英] Need to change date time with only date

问题描述

我有一个字符串类型变量，日期时间值为19/05/18 06:20:40

现在我想将此更改为仅像19/05/18这样的日期



我尝试了什么：



试过这个

格式（inDate，dd / MM / yy）

但它不适合我

I have a string type variable having date time value "19/05/18 06:20:40"
now i want to change this to only date like "19/05/18"

What I have tried:

tried this
Format(inDate, "dd/MM/yy")
but its not working for me

推荐答案

如果你愿意的话想要以特定格式显示日期，请阅读：

标准日期和时间格式字符串| Microsoft Docs [ ^ ]

自定义数字格式字符串| Microsoft Docs [ ^ ]



所以， DateTime.ToString（） [ ^ ]应该完成这项工作：

If you would like to display date in specific format, please read this:
Standard Date and Time Format Strings | Microsoft Docs[^]
Custom Numeric Format Strings | Microsoft Docs[^]

So, DateTime.ToString()[^] should do the job:

Dim stringdate = "19/05/18 06:20:40"
Dim provider As Globalization.CultureInfo = Globalization.CultureInfo.InvariantCulture
Dim mydate = DateTime.ParseExact(stringdate, "dd/MM/yy HH:mm:ss", provider)
Dim formatdate = mydate.Tostring("dd/MM/yy")
'prints 19-05-18 in Poland
'prints 19.05.18 in Germany
'prints 19/05/18 in USA

如您所见，日期格式取决于系统设置。如果日期分隔符不同于 / ，则必须使用 DateTime.ToString方法（字符串，IFormatProvider）（系统） [ ^ ]

As you can see a date format depends on system settings. In case when a date separator is different then "/", then you have to use DateTime.ToString Method (String, IFormatProvider) (System)[^]

Dim formatdate1 = mydate.Tostring("dd/MM/yy", New Globalization.CultureInfo("en-US"))

当你有一个String时，你应该使用String-Functions来处理它。在你的情况下，SubString可以解决问题...

When you have a String you should use String-Functions to handle it. In your case SubString could solve the Problem ...

OutString = inDate.SubString(0,8)

如果您的Source-Variable具有以下内容，则Format-Function将仅起作用（如您所发布的）日期类型...

The Format-Function will only work (like posted by you) if your Source-Variable has the Type of Date ...

Ralfs解决方案的替代方案可能是：

An alternative to Ralfs solution might be:

dim inDate as string = "19/05/18 06:20:40"
Console.WriteLine(inDate.Split(New Char() {" "c})(0))

这也可以正常工作日期部分的长度各不相同。

This will work correctly too if the length of the date part varies.

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