如何仅显示和存储日期而没有时间. [英] How do I only display and store the date without time.

问题描述

你好，
我声明一个日期，然后将其传递到输入框.我试图只显示日期而不显示时间，但是我似乎无法摆脱时间部分.另外，一旦解决了这个问题，我将只能将数据保存为日期，还是将字段类型设置为"datetime"，最后计算机将添加午夜秒数呢?

调用方法:

Hello,
I am declaring a date and then passing it to an input box. I''m trying to only show the date without the time but I can''t seem to get rid of the time component. Also, once I''ve solved this, will I be able to save the data as date only, or will having the field type as "datetime" end up with the computer adding midnight seconds?

Calling method:

DateTime value = DateTime.Now.Date;
if (InputBoxes.InputBoxDate("Enter invoice date", "Enter the date for this invoice.", ref value) == DialogResult.OK)

删除所有其他信息的接收方法

Receiving method with all other info removed

public static DialogResult InputBoxDate(string title, string promptText, ref DateTime value)

textBox.Text = value.Date.ToString();
value = Convert.ToDateTime(textBox.Text);
return dialogResult;

推荐答案

我认为没有Date only data type in C#.因此，即使需要only Date，也要使用C#的DateTime Type，它存储了两个Date and Time.

但是，可以使用 ^ ]或使用标准日期和时间格式字符串 [ ^ ]

如果从字符串解析和转换为字符串格式时未提供特定的区域性，则DateTime 格式会受CurrentCulture 的影响.

因此，如果需要独立于Culture 的转换，则可以按以下方式使用InvariantCulture .

I think there is no Date only data type in C#. Hence, even if only Date is required the DateTime Type of C# is to be used, which stores both the Date and Time.

However, the the DateTime in UI controls and reports can be represented as a string in the required format using either the Custom Date and Time Format Strings[^] or using Standard Date and Time Format Strings[^]

The DateTime format is influenced by the CurrentCulture if a specific culture is not given while parsing from a string and while converting to the string format.

So, if a Culture independent conversion is required then InvariantCulture can be used as follows.

DateTime today = DateTime.Now;
	
string todayAsText = today.ToString("dd/MM/yyyy",
							System.Globalization.CultureInfo.InvariantCulture);
Console.WriteLine (todayAsText);

DateTime parsedDate = DateTime.ParseExact("14/06/2012","d/M/yyyy",
							System.Globalization.CultureInfo.InvariantCulture);
//Note: d, M in the above format reads single and double digit
//date and month like 05, 5  whereas dd, MM reads only 05
Console.WriteLine (parsedDate.ToString());

/*
Output
14/06/2012
6/14/2012 12:00 
*/

因此，在上面的示例中，代码

So, in the above example, the code

textBox.Text = value.Date.ToString();
value = Convert.ToDateTime(textBox.Text);

可以使用如上例所示的DateTimeFormat 进行修改，以达到only Date

can be modified using DateTimeFormat as shown in the above example to achieve the effect of only Date

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