DateTime.CompareTo Method (Object)

 

Compares the value of this instance to a specified object that contains a specified DateTime value, and returns an integer that indicates whether this instance is earlier than, the same as, or later than the specified DateTime value.

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

Public Function CompareTo (
	value As Object
) As Integer

Parameters

value
Type: System.Object

A boxed object to compare, or null.

Return Value

Type: System.Int32

A signed number indicating the relative values of this instance and value.

Value

Description

Less than zero

This instance is earlier than value.

Zero

This instance is the same as value.

Greater than zero

This instance is later than value, or value is null.

Exception Condition
ArgumentException

value is not a DateTime.

To determine the relationship of the current instance to value, theCompareTo method compares the Ticks property of the current instance and value but ignores their Kind property. 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 properties.

Any instance of DateTime, regardless of its value, is considered greater than null.

The following example demonstrates the CompareTo method.

Dim thDay As New System.DateTime(System.DateTime.Today.Year, 7, 28)

Dim compareValue As Integer
Try
   compareValue = thDay.CompareTo(System.DateTime.Today)
Catch exp As ArgumentException
   System.Console.WriteLine("Value is not a DateTime")
End Try

If compareValue < 0 Then
   System.Console.WriteLine("{0:d} is in the past.", thDay)
ElseIf compareValue = 0 Then
   System.Console.WriteLine("{0:d} is today!", thDay)
Else   ' compareValue >= 1 
   System.Console.WriteLine("{0:d} has not come yet.", thDay)
End If

.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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