編輯

共用方式為

DateTime.Equality(DateTime, DateTime) Operator

  • Reference

Definition

Namespace:
System
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Source:
DateTime.cs
Source:
DateTime.cs
Source:
DateTime.cs

Determines whether two specified instances of DateTime are equal.

public:
 static bool operator ==(DateTime d1, DateTime d2);
public static bool operator == (DateTime d1, DateTime d2);
static member ( = ) : DateTime * DateTime -> bool
Public Shared Operator == (d1 As DateTime, d2 As DateTime) As Boolean

Parameters

d1
DateTime

The first object to compare.

d2
DateTime

The second object to compare.

Returns

Boolean

true if d1 and d2 represent the same date and time; otherwise, false.

Examples

The following example demonstrates the equality operator.

System::DateTime april19( 2001, 4, 19 );
System::DateTime otherDate( 1991, 6, 5 );

// areEqual gets false.
bool areEqual = april19 == otherDate;

otherDate = DateTime( 2001, 4, 19 );
// areEqual gets true.
areEqual = april19 == otherDate;

let april19 = DateTime(2001, 4, 19)
let otherDate = DateTime(1991, 6, 5)

// areEqual gets false.
let areEqual = april19 = otherDate

let otherDate = DateTime(2001, 4, 19)
// areEqual gets true.
let areEqual = april19 = otherDate

System.DateTime april19 = new DateTime(2001, 4, 19);
System.DateTime otherDate = new DateTime(1991, 6, 5);

// areEqual gets false.
bool areEqual = april19 == otherDate;
    
otherDate = new DateTime(2001, 4, 19);
// areEqual gets true.
areEqual = april19 == otherDate;

Dim april19 As New DateTime(2001, 4, 19)
Dim otherDate As New DateTime(1991, 6, 5)

Dim areEqual As Boolean
' areEqual gets false.
areEqual = DateTime.op_Equality(april19, otherDate)

otherDate = New DateTime(2001, 4, 19)
' areEqual gets true.
areEqual = System.DateTime.op_Equality(april19, otherDate)

Remarks

The Equality operator determines whether two DateTime values are equal by comparing their number of ticks. Before comparing DateTime objects, make sure that the objects represent times in the same time zone. You can do this by comparing the values of their Kind property.

The equivalent method for this operator is DateTime.Equals(Object)

Applies to

See also