使用 ^ ]属性...

Use the DateTimePicker.Format[^] property...

myDateTimePicker.Format = DateTimePickerFormat.Custom;
myDateTimePicker.CustomFormat = "dd/MM/yyyy";

[edit]添加了示例-OriginalGriff [/edit]

[edit]Added example - OriginalGriff[/edit]

使用CustomFormat属性并根据需要定义格式.

Use CustomFormat property and define format as per your need.

public void SetMyCustomFormat()
{
   // Set the Format type and the CustomFormat string.
   dateTimePicker1.Format = DateTimePickerFormat.Custom;
   dateTimePicker1.CustomFormat = "dd/MM/yyyy";
}

参考: MSDN:DateTimePicker.CustomFormat属性 [ ^ ]

Refer: MSDN: DateTimePicker.CustomFormat Property [^]