DateTime.Kind Property

Definition

Gets a value that indicates whether the time represented by this instance is based on local time, Coordinated Universal Time (UTC), or neither.

public DateTimeKind Kind { get; }

Property Value

One of the enumeration values that indicates what the current time represents. The default is Unspecified.

Examples

The following example uses the SpecifyKind method to demonstrate how the Kind property influences the ToLocalTime and ToUniversalTime conversion methods.

// This code example demonstrates the DateTime Kind, Now, and
// UtcNow properties, and the SpecifyKind(), ToLocalTime(),
// and ToUniversalTime() methods.

using System;

class Sample
{
    public static void Main()
    {
        // Get the date and time for the current moment, adjusted
        // to the local time zone.

        DateTime saveNow = DateTime.Now;

        // Get the date and time for the current moment expressed
        // as coordinated universal time (UTC).

        DateTime saveUtcNow = DateTime.UtcNow;
        DateTime myDt;

        // Display the value and Kind property of the current moment
        // expressed as UTC and local time.

        DisplayNow("UtcNow: ..........", saveUtcNow);
        DisplayNow("Now: .............", saveNow);
        Console.WriteLine();

        // Change the Kind property of the current moment to
        // DateTimeKind.Utc and display the result.

        myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Utc);
        Display("Utc: .............", myDt);

        // Change the Kind property of the current moment to
        // DateTimeKind.Local and display the result.

        myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Local);
        Display("Local: ...........", myDt);

        // Change the Kind property of the current moment to
        // DateTimeKind.Unspecified and display the result.

        myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Unspecified);
        Display("Unspecified: .....", myDt);
    }

    // Display the value and Kind property of a DateTime structure, the
    // DateTime structure converted to local time, and the DateTime
    // structure converted to universal time.

    public static string datePatt = @"M/d/yyyy hh:mm:ss tt";
    public static void Display(string title, DateTime inputDt)
    {
        DateTime dispDt = inputDt;
        string dtString;

        // Display the original DateTime.

        dtString = dispDt.ToString(datePatt);
        Console.WriteLine("{0} {1}, Kind = {2}",
                          title, dtString, dispDt.Kind);

        // Convert inputDt to local time and display the result.
        // If inputDt.Kind is DateTimeKind.Utc, the conversion is performed.
        // If inputDt.Kind is DateTimeKind.Local, the conversion is not performed.
        // If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
        // performed as if inputDt was universal time.

        dispDt = inputDt.ToLocalTime();
        dtString = dispDt.ToString(datePatt);
        Console.WriteLine("  ToLocalTime:     {0}, Kind = {1}",
                          dtString, dispDt.Kind);

        // Convert inputDt to universal time and display the result.
        // If inputDt.Kind is DateTimeKind.Utc, the conversion is not performed.
        // If inputDt.Kind is DateTimeKind.Local, the conversion is performed.
        // If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
        // performed as if inputDt was local time.

        dispDt = inputDt.ToUniversalTime();
        dtString = dispDt.ToString(datePatt);
        Console.WriteLine("  ToUniversalTime: {0}, Kind = {1}",
                          dtString, dispDt.Kind);
        Console.WriteLine();
    }

    // Display the value and Kind property for DateTime.Now and DateTime.UtcNow.

    public static void DisplayNow(string title, DateTime inputDt)
    {
        string dtString = inputDt.ToString(datePatt);
        Console.WriteLine("{0} {1}, Kind = {2}",
                          title, dtString, inputDt.Kind);
    }
}

/*
This code example produces the following results:

UtcNow: .......... 5/6/2005 09:34:42 PM, Kind = Utc
Now: ............. 5/6/2005 02:34:42 PM, Kind = Local

Utc: ............. 5/6/2005 02:34:42 PM, Kind = Utc
  ToLocalTime:     5/6/2005 07:34:42 AM, Kind = Local
  ToUniversalTime: 5/6/2005 02:34:42 PM, Kind = Utc

Local: ........... 5/6/2005 02:34:42 PM, Kind = Local
  ToLocalTime:     5/6/2005 02:34:42 PM, Kind = Local
  ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc

Unspecified: ..... 5/6/2005 02:34:42 PM, Kind = Unspecified
  ToLocalTime:     5/6/2005 07:34:42 AM, Kind = Local
  ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc

*/

Remarks

You can explicitly set the Kind property of a new DateTime value to a particular DateTimeKind value by calling the SpecifyKind method.

The Kind property allows a DateTime value to clearly reflect either Coordinated Universal Time (UTC) or the local time. In contrast, the DateTimeOffset structure can unambiguously reflect any time in any time zone as a single point in time.

Applies to

Produkt Wersje
.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 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

See also