TimeZone Classe

Definizione

public ref class TimeZone abstract

[System.Obsolete("System.TimeZone has been deprecated.  Please investigate the use of System.TimeZoneInfo instead.")]
public abstract class TimeZone

[System.Obsolete("System.TimeZone has been deprecated. Investigate the use of System.TimeZoneInfo instead.")]
public abstract class TimeZone

[System.Serializable]
public abstract class TimeZone

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class TimeZone

[<System.Obsolete("System.TimeZone has been deprecated.  Please investigate the use of System.TimeZoneInfo instead.")>]
type TimeZone = class

[<System.Obsolete("System.TimeZone has been deprecated. Investigate the use of System.TimeZoneInfo instead.")>]
type TimeZone = class

[<System.Serializable>]
type TimeZone = class

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type TimeZone = class

Public MustInherit Class TimeZone

Ereditarietà

Object

TimeZone

Attributi

ObsoleteAttribute SerializableAttribute ComVisibleAttribute

Esempio

Nell'esempio seguente viene fatto riferimento e vengono visualizzati gli elementi della classe selezionati TimeZone .

// Example of selected TimeZone class elements.
using namespace System;
using namespace System::Globalization;
int main()
{
   String^ dataFmt = "{0,-30}{1}";
   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( String::Concat( "\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 Daylight Time

Current date and time:        2006-01-06 16:47
Daylight saving time?         False
Coordinated Universal Time:   2006-01-07 00:47
UTC offset:                   -08:00:00

Daylight saving time for year 2006:
2006-04-02 02:00 to 2006-10-29 02:00, delta: 01:00:00
*/

// 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 Daylight Time

Current date and time:        2006-01-06 16:47
Daylight saving time?         False
Coordinated Universal Time:   2006-01-07 00:47
UTC offset:                   -08:00:00

Daylight saving time for year 2006:
2006-04-02 02:00 to 2006-10-29 02:00, delta: 01:00:00
*/

' Example of selected TimeZone class elements.
Imports System.Globalization

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 Daylight Time
'
'Current date and time:        2006-01-06 16:47
'Daylight saving time?         False
'Coordinated Universal Time:   2006-01-07 00:47
'UTC offset:                   -08:00:00
'
'Daylight saving time for year 2006:
'2006-04-02 02:00 to 2006-10-29 02:00, delta: 01:00:00

Commenti

Un fuso orario è un'area geografica in cui viene usata la stessa ora solare.

È possibile usare la TimeZone classe per recuperare informazioni sul fuso orario corrente e per convertire gli orari dall'ora locale all'ora UTC (Coordinated Universal Time) o viceversa. Tuttavia, non è possibile usare la TimeZone classe per rappresentare fusi orari diversi dal fuso orario locale o per gestire le conversioni di data e ora da un fuso orario a un altro. A questo scopo, usare la TimeZoneInfo classe . È possibile usare questa classe per recuperare informazioni su qualsiasi fuso orario definito nel sistema locale, per creare fusi orari personalizzati e per convertire gli orari da un fuso orario a un altro.

La TimeZone classe supporta solo una singola regola di regolazione dell'ora legale per il fuso orario locale. Di conseguenza, la TimeZone classe può segnalare con precisione le informazioni sull'ora legale o eseguire la conversione tra ora UTC e ora locale solo per il periodo in cui è attiva la regola di rettifica più recente. Al contrario, la TimeZoneInfo classe supporta più regole di regolazione, che consente di usare i dati cronologici del fuso orario.

Note per gli implementatori

Oltre a fornire implementazioni per i relativi abstract membri (quelli contrassegnati MustOverride in Visual Basic), è importante che le classi derivate dall'override TimeZone del comportamento predefinito del ToLocalTime(DateTime) metodo. Questo perché il comportamento predefinito di ToLocalTime(DateTime) nella .NET Framework versione 2.0 non dipende da una chiamata a GetUtcOffset(DateTime), come accade nelle versioni .NET Framework 1.0 e 1.1. Per informazioni dettagliate, vedere il ToLocalTime(DateTime) metodo .

Costruttori

Proprietà

Metodi

Si applica a

Vedi anche

• DateTime
• DateTimeOffset
• TimeZoneInfo