Articolo
11/18/2011

DateTimeOffset.Equality Operator

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

Determines whether two specified DateTimeOffset objects represent the same point in time.

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

Syntax

'Declaration
Public Shared Operator = ( _
    left As DateTimeOffset, _
    right As DateTimeOffset _
) As Boolean

public static bool operator ==(
    DateTimeOffset left,
    DateTimeOffset right
)

Parameters

left
Type: System.DateTimeOffset
The first object to compare.

right
Type: System.DateTimeOffset
The second object to compare.

Return Value

Type: System.Boolean
true if both DateTimeOffset objects have the same UtcDateTime value; otherwise, false.

Remarks

The Equality method defines the operation of the equality operator for DateTimeOffset objects. It enables code such as the following:

Dim date1 As New DateTimeOffset(#6/3/2007 2:45:00 PM#, _
             New TimeSpan(-7, 0, 0))
Dim date2 As New DateTimeOffset(#6/3/2007 3:45:00 PM#, _
             New TimeSpan(-6, 0, 0))
Dim date3 As New DateTimeOffset(date1.DateTime, _
             New TimeSpan(-6, 0, 0))
outputBlock.Text &= (date1 = date2) & vbCrLf        ' Displays True
outputBlock.Text &= (date1 = date3) & vbCrLf        ' Displays False

DateTimeOffset date1 = new DateTimeOffset(2007, 6, 3, 14, 45, 0,
             new TimeSpan(-7, 0, 0));
DateTimeOffset date2 = new DateTimeOffset(2007, 6, 3, 15, 45, 0,
             new TimeSpan(-6, 0, 0));
DateTimeOffset date3 = new DateTimeOffset(date1.DateTime,
             new TimeSpan(-6, 0, 0));
outputBlock.Text += (date1 == date2) + "\n";        // Displays True
outputBlock.Text += (date1 == date3) + "\n";        // Displays False

Before evaluating the left and right operands for equality, the operator converts both values to Coordinated Universal Time (UTC). The operation is equivalent to the following:

Return first.UtcDateTime = second.UtcDateTime

return first.UtcDateTime == second.UtcDateTime;

In other words, the Equality method determines whether the two DateTimeOffset objects represent a single point in time. It directly compares neither dates and times nor offsets. To determine whether two DateTimeOffset objects represent the same time and have the same offset value, use the EqualsExact method.

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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