TimeZone Class

Represents a time zone.

For a list of all members of this type, see TimeZone Members.

System.Object
   System.TimeZone

[Visual Basic]
<Serializable>
MustInherit Public Class TimeZone
[C#]
[Serializable]
public abstract class TimeZone
[C++]
[Serializable]
public __gc __abstract class TimeZone
[JScript]
public
   Serializable
abstract class TimeZone

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Remarks

A time zone is a geographical region in which the same standard time is used.

Example

[Visual Basic, C#, C++] The following code example references and displays selected TimeZone class elements.

[Visual Basic] 
' Example of selected TimeZone class elements.
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Module TimeZoneDemo

    Sub Main( )

        Const dataFmt As String = "{0,-30}{1}"
        Const timeFmt As String = "{0,-30}{1:yyyy-MM-dd HH:mm}"

        Console.WriteLine( "This example of selected " & _
            "TimeZone class elements generates the following " & _
            vbCrLf & "output, which varies depending on the " & _
            "time zone in which it is run." & vbCrLf )

        ' Get the local time zone and the current local time and year.
        Dim localZone As TimeZone = TimeZone.CurrentTimeZone
        Dim currentDate As DateTime = DateTime.Now
        Dim currentYear As Integer = currentDate.Year

        ' Display the names for standard time and daylight saving 
        ' time for the local time zone.
        Console.WriteLine( dataFmt, "Standard time name:", _
            localZone.StandardName )
        Console.WriteLine( dataFmt, "Daylight saving time name:", _
            localZone.DaylightName )

        ' Display the current date and time and show if they occur 
        ' in daylight saving time.
        Console.WriteLine( vbCrLf & timeFmt, _
            "Current date and time:", currentDate )
        Console.WriteLine( dataFmt, "Daylight saving time?", _
            localZone.IsDaylightSavingTime( currentDate ) )

        ' Get the current Coordinated Universal Time (UTC) and UTC 
        ' offset.
        Dim currentUTC As DateTime = _
            localZone.ToUniversalTime( currentDate )
        Dim currentOffset As TimeSpan = _
            localZone.GetUtcOffset( currentDate )

        Console.WriteLine( timeFmt, "Coordinated Universal Time:", _
            currentUTC )
        Console.WriteLine( dataFmt, "UTC offset:", currentOffset )

        ' Get the DaylightTime object for the current year.
        Dim daylight As DaylightTime = _
            localZone.GetDaylightChanges( currentYear )

        ' Display the daylight saving time range for the current year.
        Console.WriteLine( vbCrLf & _
            "Daylight saving time for year {0}:", currentYear )
        Console.WriteLine( "{0:yyyy-MM-dd HH:mm} to " & _
            "{1:yyyy-MM-dd HH:mm}, delta: {2}", _
            daylight.Start, daylight.End, daylight.Delta )
    End Sub 
End Module 

' This example of selected TimeZone class elements generates the following
' output, which varies depending on the time zone in which it is run.
' 
' Standard time name:           Pacific Standard Time
' Daylight saving time name:    Pacific Standard Time
' 
' Current date and time:        2003-05-05 12:38
' Daylight saving time?         True
' Coordinated Universal Time:   2003-05-05 19:38
' UTC offset:                   -07:00:00
' 
' Daylight saving time for year 2003:
' 2003-04-06 02:00 to 2003-10-26 02:00, delta: 01:00:00

[C#] 
// Example of selected TimeZone class elements.
using System;
using System.Globalization;

class TimeZoneDemo
{
    static void Main( )
    {
        const string dataFmt = "{0,-30}{1}";
        const string timeFmt = "{0,-30}{1:yyyy-MM-dd HH:mm}";

        Console.WriteLine(
            "This example of selected TimeZone class " +
            "elements generates the following \n" +
            "output, which varies depending on the " +
            "time zone in which it is run.\n" );

        // Get the local time zone and the current local time and year.
        TimeZone localZone = TimeZone.CurrentTimeZone;
        DateTime currentDate = DateTime.Now;
        int      currentYear = currentDate.Year;

        // Display the names for standard time and daylight saving 
        // time for the local time zone.
        Console.WriteLine( dataFmt, "Standard time name:", 
            localZone.StandardName );
        Console.WriteLine( dataFmt, "Daylight saving time name:", 
            localZone.DaylightName );

        // Display the current date and time and show if they occur 
        // in daylight saving time.
        Console.WriteLine( "\n" + timeFmt, "Current date and time:",
            currentDate );
        Console.WriteLine( dataFmt, "Daylight saving time?", 
            localZone.IsDaylightSavingTime( currentDate ) );

        // Get the current Coordinated Universal Time (UTC) and UTC 
        // offset.
        DateTime currentUTC = 
            localZone.ToUniversalTime( currentDate );
        TimeSpan currentOffset = 
            localZone.GetUtcOffset( currentDate );

        Console.WriteLine( timeFmt, "Coordinated Universal Time:", 
            currentUTC );
        Console.WriteLine( dataFmt, "UTC offset:", currentOffset );

        // Get the DaylightTime object for the current year.
        DaylightTime daylight = 
            localZone.GetDaylightChanges( currentYear );

        // Display the daylight saving time range for the current year.
        Console.WriteLine( 
            "\nDaylight saving time for year {0}:", currentYear );
        Console.WriteLine( "{0:yyyy-MM-dd HH:mm} to " +
            "{1:yyyy-MM-dd HH:mm}, delta: {2}", 
            daylight.Start, daylight.End, daylight.Delta );
    } 
} 

/*
This example of selected TimeZone class elements generates the following
output, which varies depending on the time zone in which it is run.

Standard time name:           Pacific Standard Time
Daylight saving time name:    Pacific Standard Time

Current date and time:        2003-05-08 11:10
Daylight saving time?         True
Coordinated Universal Time:   2003-05-08 18:10
UTC offset:                   -07:00:00

Daylight saving time for year 2003:
2003-04-06 02:00 to 2003-10-26 02:00, delta: 01:00:00
*/ 

[C++] 
// Example of selected TimeZone class elements.
#using <mscorlib.dll>
using namespace System;
using namespace System::Globalization;

void main( )
{
    String* dataFmt = S"{0,-30}{1}";
    String* timeFmt = S"{0,-30}{1:yyyy-MM-dd HH:mm}";

    Console::WriteLine(
        S"This example of selected TimeZone class " 
        S"elements generates the following \n" 
        S"output, which varies depending on the " 
        S"time zone in which it is run.\n" );

    // Get the local time zone and the current local time and year.
    TimeZone* localZone = TimeZone::CurrentTimeZone;
    DateTime  currentDate = DateTime::Now;
    int       currentYear = currentDate.Year;

    // Display the names for standard time and daylight saving 
    // time for the local time zone.
    Console::WriteLine( dataFmt, S"Standard time name:", 
        localZone->StandardName );
    Console::WriteLine( dataFmt, S"Daylight saving time name:", 
        localZone->DaylightName );

    // Display the current date and time and show if they occur 
    // in daylight saving time.
    Console::WriteLine( String::Concat( S"\n", timeFmt ), 
        S"Current date and time:", __box( currentDate ) );
    Console::WriteLine( dataFmt, S"Daylight saving time?", 
        __box( localZone->IsDaylightSavingTime( currentDate ) ) );

    // Get the current Coordinated Universal Time (UTC) and UTC 
    // offset.
    DateTime currentUTC = 
        localZone->ToUniversalTime( currentDate );
    TimeSpan currentOffset = 
        localZone->GetUtcOffset( currentDate );

    Console::WriteLine( timeFmt, S"Coordinated Universal Time:", 
        __box( currentUTC ) );
    Console::WriteLine( dataFmt, S"UTC offset:", 
        __box( currentOffset ) );

    // Get the DaylightTime object for the current year.
    DaylightTime* daylight = 
        localZone->GetDaylightChanges( currentYear );

    // Display the daylight saving time range for the current year.
    Console::WriteLine( S"\nDaylight saving time for year {0}:", 
        __box( currentYear ) );
    Console::WriteLine( S"{0:yyyy-MM-dd HH:mm} to " 
        S"{1:yyyy-MM-dd HH:mm}, delta: {2}", 
        __box( daylight->Start ), __box( daylight->End ), 
        __box( daylight->Delta ) );
}

/*
This example of selected TimeZone class elements generates the following
output, which varies depending on the time zone in which it is run.

Standard time name:           Pacific Standard Time
Daylight saving time name:    Pacific Standard Time

Current date and time:        2003-05-08 11:11
Daylight saving time?         True
Coordinated Universal Time:   2003-05-08 18:11
UTC offset:                   -07:00:00

Daylight saving time for year 2003:
2003-04-06 02:00 to 2003-10-26 02:00, delta: 01:00:00
*/ 

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button in the upper-left corner of the page.

Requirements

Namespace: System

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: Mscorlib (in Mscorlib.dll)

See Also

TimeZone Members | System Namespace