DateTime picker C# format

问题

I have a DateTime picker to add arrival time to a list, I have 2 questions about it:

1. How can I get it to show dates like 12-Jan-2012 Instead of 12/01/12?
2. How can I get it to show the time after the date but not the current time, as thats what is shows atm.

My current code is not very advanced its just:

theVisit.ArrivalTime = DateTimePicker1.Value

回答1:

Something like this will display the date and time:

DateTimePicker1.Value.ToString("d-MMM-yyyy hh:mm:ss");

To override the default DateTimePicker settings, you can do this:

DateTimePicker1.Format = DateTimePickerFormat.Custom;
DateTimePicker1.CustomFormat = "d-MMM-yyyy  hh:mm:ss";

You can show a different time by modifying the format string, e.g.:

DateTimePicker1.CustomFormat = "d-MMM-yyyy 12:00:00";

or even

DateTime otherTime = DateTime.Now;
DateTimePicker1.CustomFormat = "d-MMM-yyyy " + otherTime.ToString("hh:mm:ss");

回答2:

For it to show in that format in the picker, set the properties below

dateTimePicker1.Format = DateTimePickerFormat.Custom;
dateTimePicker1.CustomFormat = "dd-MMM-yyyy  hh:mm:ss";

回答3:

You're looking for DateTime Format strings. There's a great article on them on MSDN. There's two types:

1. Standard DateTime Formats
2. Custom DateTime Formats

You can use these to construct the datetime to look how you want it to. For your example, you would use :

DateTimePicker1.Value.ToString("dd-MMM-yyyy hh:mm:ss")

回答4:

First, to alter how your DateTimePicker displays DateTimes:

DateTimePicker1.CustomFormat = "d-MMM-yyyy hh:mm:ss";
DateTimePicker1.Format = System.Windows.Forms.DateTimePickerFormat.Custom;

Your code:

theVisit.ArrivalTime = DateTimePicker1.Value;

Would not change, because the DateTimePicker1.Value isn't any different, it's just displayed according to your format.

If you want the control to display a specific time (not the current time), you have to give the control that value:

DateTimePicker1.Value = new DateTime(2012, 12, 21, 23, 59, 59);

Otherwise it will display the current time as of the form creation.

回答5:

You may check datetimepicker like this to check if it is empty.

if(DatTimePicker1.Text.Equals(" "))
{
     MessageBox.Show("DateTimePicker is empty");
}

来源：https://stackoverflow.com/questions/13711358/datetime-picker-c-sharp-format