DateTime.Compare(DateTime, DateTime) Method
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Compares two instances of DateTime and returns an integer that indicates whether the first instance is earlier than, the same as, or later than the second instance.
public:
static int Compare(DateTime t1, DateTime t2);
public static int Compare (DateTime t1, DateTime t2);
static member Compare : DateTime * DateTime -> int
Public Shared Function Compare (t1 As DateTime, t2 As DateTime) As Integer
- t1
- DateTime
The first object to compare.
- t2
- DateTime
The second object to compare.
A signed number indicating the relative values of t1
and t2
.
Value Type | Condition |
---|---|
Less than zero | t1 is earlier than t2 .
|
Zero | t1 is the same as t2 .
|
Greater than zero | t1 is later than t2 .
|
The following example demonstrates the Compare method.
DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
DateTime date2 = new DateTime(2009, 8, 1, 12, 0, 0);
int result = DateTime.Compare(date1, date2);
string relationship;
if (result < 0)
relationship = "is earlier than";
else if (result == 0)
relationship = "is the same time as";
else
relationship = "is later than";
Console.WriteLine("{0} {1} {2}", date1, relationship, date2);
// The example displays the following output for en-us culture:
// 8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM
let date1 = DateTime(2009, 8, 1, 0, 0, 0)
let date2 = DateTime(2009, 8, 1, 12, 0, 0)
let result = DateTime.Compare(date1, date2)
let relationship =
if result < 0 then
"is earlier than"
elif result = 0 then
"is the same time as"
else
"is later than"
printfn $"{date1} {relationship} {date2}"
// The example displays the following output for en-us culture:
// 8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM
Module Example
Public Sub Main()
Dim date1 As Date = #08/01/2009 12:00AM#
Dim date2 As Date = #08/01/2009 12:00PM#
Dim result As Integer = DateTime.Compare(date1, date2)
Dim relationship As String
If result < 0 Then
relationship = "is earlier than"
ElseIf result = 0 Then
relationship = "is the same time as"
Else
relationship = "is later than"
End If
Console.WriteLine("{0} {1} {2}", date1, relationship, date2)
End Sub
End Module
' The example displays the following output:
' 8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM
To determine the relationship of t1
to t2
, the Compare method compares the Ticks property of t1
and t2
but ignores their Kind property. Before comparing DateTime objects, ensure that the objects represent times in the same time zone.
Produkt | Versioner |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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