Get short date for System Nullable datetime (datetime ?) in C#

问题

How to get short date for Get short date for System Nullable datetime (datetime ?)

for ed 12/31/2013 12:00:00 --> only should return 12/31/2013.

I don't see the ToShortDateString available.

回答1:

You need to use .Value first (Since it's nullable).

var shortString = yourDate.Value.ToShortDateString();

But also check that yourDate has a value:

if (yourDate.HasValue) {
   var shortString = yourDate.Value.ToShortDateString();
}

回答2:

string.Format("{0:d}", dt); works:

DateTime? dt = (DateTime?)DateTime.Now;
string dateToday = string.Format("{0:d}", dt);

Demo

If the DateTime? is null this returns an empty string.

Note that the "d" custom format specifier is identical to ToShortDateString.

回答3:

That function is absolutely available within the DateTime class. Please refer to the MSDN documentation for the class: http://msdn.microsoft.com/en-us/library/system.datetime.toshortdatestring.aspx

Since Nullable is a generic on top of the DateTime class you will need to use the .Value property of the DateTime? instance to call the underlying class methods as seen below:

DateTime? date;
String shortDateString;
shortDateString = date.Value.ToShortDateString();

Just be aware that if you attempt this while date is null an exception will be thrown.

回答4:

If you want to be guaranteed to have a value to display, you can use GetValueOrDefault() in conjunction with the ToShortDateString method that other postelike this:

yourDate.GetValueOrDefault().ToShortDateString();

This will show 01/01/0001 if the value happened to be null.

回答5:

Check if it has value, then get required date

if (nullDate.HasValue)
{
     nullDate.Value.ToShortDateString();
}

回答6:

Try

    if (nullDate.HasValue)
    {
         nullDate.Value.ToShortDateString();
    }

回答7:

If you are using .cshtml then you can use as

<td>@(item.InvoiceDate==null?"":DateTime.Parse(item.YourDate.ToString()).ToShortDateString())</td>

or if you try to find short date in action or method in c# then

yourDate.GetValueOrDefault().ToShortDateString();

And is already answered above by Steve.

I have shared this as i used in my project. it works fine. Thank you.

来源：https://stackoverflow.com/questions/18982303/get-short-date-for-system-nullable-datetime-datetime-in-c-sharp

标签

.net

datetime

nullable