Makale
11/18/2011

DateTime.MaxValue Field

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents the largest possible value of DateTime. This field is read-only.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Shared ReadOnly MaxValue As DateTime

public static readonly DateTime MaxValue

Exceptions

Exception	Condition
ArgumentOutOfRangeException	DateTime.MaxValue is outside the range of the current culture's default calendar or of a specified culture's default calendar.

Remarks

The value of this constant is equivalent to 23:59:59.9999999, December 31, 9999, exactly one 100-nanosecond tick before 00:00:00, January 1, 10000.

Some calendars, such as the UmAlQuraCalendar, support an upper date range that is earlier than MaxValue. In these cases, trying to access MaxValue in variable assignments or formatting and parsing operations can throw an ArgumentOutOfRangeException. Rather than retrieving the value of DateTime.MaxValue, you can retrieve the value of the specified culture's latest valid date value from the System.Globalization.CultureInfo.DateTimeFormat.Calendar.MaxSupportedDateTime property.

Examples

The following example instantiates a DateTime object by passing its constructor an Int64 value that represents a number of ticks. Before 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. If not, it throws an ArgumentOutOfRangeException.

' 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
   outputBlock.Text += String.Format("{0:N0} is less than {1:N0} ticks.", _
                                     numberOfTicks, _
                                     Date.MinValue.Ticks)
Else
   outputBlock.Text += String.Format("{0:N0} is greater than {1:N0} ticks.", _
                                     numberOfTicks, _
                                     Date.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.

// 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)
   outputBlock.Text += String.Format("{0:N0} is less than {1:N0} ticks.",
                   numberOfTicks,
                   DateTime.MinValue.Ticks);
else
   outputBlock.Text += String.Format("{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.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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