DateTime.MaxValue Field

Definition

代表 DateTime 最大的可能值。Represents the largest possible value of DateTime. 此欄位是唯讀的。This field is read-only.

public: static initonly DateTime MaxValue;
public static readonly DateTime MaxValue;
 staticval mutable MaxValue : DateTime
Public Shared ReadOnly MaxValue As DateTime 

Field Value

DateTime

Examples

下列範例會藉由將 DateTime 物件的函式傳遞給代表刻度數的 Int64 值來具現化。The following example instantiates a DateTime object by passing its constructor an Int64 value that represents a number of ticks. 叫用此函式之前,此範例會確保此值大於或等於 DateTime.MinValue.Ticks 且小於或等於 DateTime.MaxValue.TicksBefore invoking the constructor, the example ensures that this value is greater than or equal to DateTime.MinValue.Ticks and less than or equal to DateTime.MaxValue.Ticks. 如果沒有,則會擲回 ArgumentOutOfRangeExceptionIf not, it throws an ArgumentOutOfRangeException.

// Attempt to assign an out-of-range value to a DateTime constructor.
long numberOfTicks = Int64.MaxValue;
DateTime validDate;

// Validate the value.
if (numberOfTicks >= DateTime.MinValue.Ticks &&
    numberOfTicks <= DateTime.MaxValue.Ticks)
   validDate = new DateTime(numberOfTicks);
else if (numberOfTicks < DateTime.MinValue.Ticks)
   Console.WriteLine("{0:N0} is less than {1:N0} ticks.",
                     numberOfTicks,
                     DateTime.MinValue.Ticks);
else
   Console.WriteLine("{0:N0} is greater than {1:N0} ticks.",
                     numberOfTicks,
                     DateTime.MaxValue.Ticks);
// The example displays the following output:
//   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.
' Attempt to assign an out-of-range value to a DateTime constructor.
Dim numberOfTicks As Long = Int64.MaxValue
Dim validDate As Date

' Validate the value.
If numberOfTicks >= Date.MinValue.Ticks And _
   numberOfTicks <= Date.MaxValue.Ticks Then
   validDate = New Date(numberOfTicks)
ElseIf numberOfTicks < Date.MinValue.Ticks Then
   Console.WriteLine("{0:N0} is less than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MinValue.Ticks)      
Else                                                   
   Console.WriteLine("{0:N0} is greater than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MaxValue.Ticks)     
End If
' The example displays the following output:
'   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.      

Remarks

這個常數的值相當於23:59: 59.9999999 UTC,西曆年12月31日,在9999年1月 10000 1 日的 00:00:00 UTC 之前,正好 1 100-毫微秒。The value of this constant is equivalent to 23:59:59.9999999 UTC, December 31, 9999 in the Gregorian calendar, exactly one 100-nanosecond tick before 00:00:00 UTC, January 1, 10000.

某些行事曆(例如 ThaiBuddhistCalendar)支援的日期範圍早于 MaxValue的上限。Some calendars, such as the ThaiBuddhistCalendar, support an upper date range that is earlier than MaxValue. 在這些情況下,嘗試存取變數指派或格式設定和剖析作業中的 MaxValue 可能會擲回 ArgumentOutOfRangeExceptionIn these cases, trying to access MaxValue in variable assignments or formatting and parsing operations can throw an ArgumentOutOfRangeException. 您可以從 Calendar.MaxSupportedDateTime 屬性抓取指定文化特性的最新有效日期值,而不是抓取 DateTime.MaxValue的值。Rather than retrieving the value of DateTime.MaxValue, you can retrieve the value of the specified culture's latest valid date value from the Calendar.MaxSupportedDateTime property.

Applies to

See also