TimeZone.ToUniversalTime-Methode
Gibt die koordinierte Weltzeit (UTC) zurück, die einer angegebenen Ortszeit entspricht.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Overridable Function ToUniversalTime ( _
time As DateTime _
) As DateTime
'Usage
Dim instance As TimeZone
Dim time As DateTime
Dim returnValue As DateTime
returnValue = instance.ToUniversalTime(time)
public virtual DateTime ToUniversalTime (
DateTime time
)
public:
virtual DateTime ToUniversalTime (
DateTime time
)
public DateTime ToUniversalTime (
DateTime time
)
public function ToUniversalTime (
time : DateTime
) : DateTime
Parameter
- time
Die lokalen Werte für Datum und Uhrzeit.
Rückgabewert
Eine DateTime-Instanz, deren Wert die time entsprechende UTC-Zeit ist.
Hinweise
Die koordinierte Weltzeit (UTC) wurde früher als Greenwich Mean Time (GMT) bezeichnet. Die Ortszeit ist die Zeit auf dem gegenwärtig verwendeten Computer. Offset ist die Differenz zwischen Ortszeit und UTC. Dies bedeutet:
UTC = Ortszeit - Offset
Beispiel
Im folgenden Codebeispiel werden mithilfe der ToUniversalTime-Methode die UTC-Zeiten (Coordinated Universal Time) zurückgegeben, die ausgewählten lokalen Zeiten entsprechen.
' Example of the TimeZone.IsDaylightSavingTime( DateTime ),
' TimeZone.IsDaylightSavingTime( DateTime, DaylightTime ), and
' TimeZone.ToUniversalTime( DateTime ) methods.
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic
Module DaylightTimeDemo
Sub Main( )
Const headFmt As String = "{0,-22}{1,-10}{2,-10}{3,-10}{4}"
' Get the local time zone and a base local time.
Dim localZone As TimeZone = TimeZone.CurrentTimeZone
Dim localTime As DateTime = new DateTime( 2001, 1, 1 )
Console.WriteLine( "This example of " & vbCrLf & _
" TimeZone.IsDaylightSavingTime( DateTime ), " & _
vbCrLf & " TimeZone.IsDaylightSavingTime( " & _
"DateTime, DaylightTime ), and " & vbCrLf & _
" TimeZone.ToUniversalTime( DateTime )" & vbCrLf & _
"generates the following output, which varies " & _
"depending on the " & vbCrLf & "time zone in which " & _
"it is run." & vbCrLf )
Console.WriteLine( "The example creates " & _
"several local times and the corresponding " & vbCrLf & _
"Coordinated Universal Times (UTC) and shows if " & _
"they occur in " & vbCrLf & "daylight saving time " & _
"(DST), both for specified years and for " & vbCrLf & _
"any year." & vbCrLf )
Console.WriteLine( "Local time: {0}" & vbCrLf, _
localZone.StandardName )
Console.WriteLine( headFmt, "Local Date and Time", _
"2001 DST?", "2002 DST?", "Any DST?", "Corresponding UTC" )
Console.WriteLine( headFmt, "-------------------", _
"---------", "---------", "--------", "-----------------" )
' Create DaylightTime objects for specific years.
Dim daylight2001 As DaylightTime = _
localZone.GetDaylightChanges( 2001 )
Dim daylight2002 As DaylightTime = _
localZone.GetDaylightChanges( 2002 )
' Generate several local times.
Dim loopX As Integer
For loopX = 0 to 10
' Calculate the corresponding UTC.
Dim utcTime As DateTime = _
localZone.ToUniversalTime( localTime )
' Show if dates and times occur in daylight saving
' time, for specified years and for any year.
Console.WriteLine( "{0,-22:yyyy-MM-dd HH:mm}" & _
"{1,-10}{2,-10}{3,-10}{4:yyyy-MM-dd HH:mm}", _
localTime, _
TimeZone.IsDaylightSavingTime( _
localTime, daylight2001 ), _
TimeZone.IsDaylightSavingTime( _
localTime, daylight2002 ), _
localZone.IsDaylightSavingTime( localTime ), _
utcTime )
' Advance to another local time.
localTime = localTime.AddDays( 109.1 )
Next loopX
End Sub
End Module
' This example of
' TimeZone.IsDaylightSavingTime( DateTime ),
' TimeZone.IsDaylightSavingTime( DateTime, DaylightTime ), and
' TimeZone.ToUniversalTime( DateTime )
' generates the following output, which varies depending on the
' time zone in which it is run.
'
' The example creates several local times and the corresponding
' Coordinated Universal Times (UTC) and shows if they occur in
' daylight saving time (DST), both for specified years and for
' any year.
'
' Local time: Pacific Standard Time
'
' Local Date and Time 2001 DST? 2002 DST? Any DST? Corresponding UTC
' ------------------- --------- --------- -------- -----------------
' 2001-01-01 00:00 False False False 2001-01-01 08:00
' 2001-04-20 02:24 True False True 2001-04-20 09:24
' 2001-08-07 04:48 True False True 2001-08-07 11:48
' 2001-11-24 07:12 False False False 2001-11-24 15:12
' 2002-03-13 09:36 False False False 2002-03-13 17:36
' 2002-06-30 12:00 False True True 2002-06-30 19:00
' 2002-10-17 14:24 False True True 2002-10-17 21:24
' 2003-02-03 16:48 False False False 2003-02-04 00:48
' 2003-05-23 19:12 False False True 2003-05-24 02:12
' 2003-09-09 21:36 False False True 2003-09-10 04:36
' 2003-12-28 00:00 False False False 2003-12-28 08:00
// Example of the TimeZone.IsDaylightSavingTime( DateTime ),
// TimeZone.IsDaylightSavingTime( DateTime, DaylightTime ), and
// TimeZone.ToUniversalTime( DateTime ) methods.
using System;
using System.Globalization;
class DaylightTimeDemo
{
static void Main( )
{
const string headFmt = "{0,-22}{1,-10}{2,-10}{3,-10}{4}";
// Get the local time zone and a base local time.
TimeZone localZone = TimeZone.CurrentTimeZone;
DateTime localTime = new DateTime( 2001, 1, 1 );
Console.WriteLine( "This example of \n" +
" TimeZone.IsDaylightSavingTime( DateTime ), \n" +
" TimeZone.IsDaylightSavingTime( " +
"DateTime, DaylightTime ), and \n" +
" TimeZone.ToUniversalTime( DateTime )\n" +
"generates the following output, which varies " +
"depending on the \ntime zone in which it is run.\n" );
Console.WriteLine( "The example creates several local " +
"times and the corresponding \nCoordinated Universal " +
"Times (UTC) and shows if they occur in \ndaylight " +
"saving time (DST), both for specified years " +
"and for \nany year.\n" );
Console.WriteLine( "Local time: {0}\n",
localZone.StandardName );
Console.WriteLine( headFmt, "Local Date and Time", "2001 DST?",
"2002 DST?", "Any DST?", "Corresponding UTC" );
Console.WriteLine( headFmt, "-------------------", "---------",
"---------", "--------", "-----------------" );
// Create DaylightTime objects for specific years.
DaylightTime daylight2001 =
localZone.GetDaylightChanges( 2001 );
DaylightTime daylight2002 =
localZone.GetDaylightChanges( 2002 );
// Generate several local times.
for( int loopX = 0; loopX <= 10; loopX++ )
{
// Calculate the corresponding UTC.
DateTime utcTime =
localZone.ToUniversalTime( localTime );
// Show if dates and times occur in daylight saving
// time, for specified years and for any year.
Console.WriteLine( "{0,-22:yyyy-MM-dd HH:mm}" +
"{1,-10}{2,-10}{3,-10}{4:yyyy-MM-dd HH:mm}",
localTime,
TimeZone.IsDaylightSavingTime(
localTime, daylight2001 ),
TimeZone.IsDaylightSavingTime(
localTime, daylight2002 ),
localZone.IsDaylightSavingTime( localTime ),
utcTime );
// Advance to another local time.
localTime = localTime.AddDays( 109.1 );
}
}
}
/*
This example of
TimeZone.IsDaylightSavingTime( DateTime ),
TimeZone.IsDaylightSavingTime( DateTime, DaylightTime ), and
TimeZone.ToUniversalTime( DateTime )
generates the following output, which varies depending on the
time zone in which it is run.
The example creates several local times and the corresponding
Coordinated Universal Times (UTC) and shows if they occur in
daylight saving time (DST), both for specified years and for
any year.
Local time: Pacific Standard Time
Local Date and Time 2001 DST? 2002 DST? Any DST? Corresponding UTC
------------------- --------- --------- -------- -----------------
2001-01-01 00:00 False False False 2001-01-01 08:00
2001-04-20 02:24 True False True 2001-04-20 09:24
2001-08-07 04:48 True False True 2001-08-07 11:48
2001-11-24 07:12 False False False 2001-11-24 15:12
2002-03-13 09:36 False False False 2002-03-13 17:36
2002-06-30 12:00 False True True 2002-06-30 19:00
2002-10-17 14:24 False True True 2002-10-17 21:24
2003-02-03 16:48 False False False 2003-02-04 00:48
2003-05-23 19:12 False False True 2003-05-24 02:12
2003-09-09 21:36 False False True 2003-09-10 04:36
2003-12-28 00:00 False False False 2003-12-28 08:00
*/
// Example of the TimeZone::IsDaylightSavingTime( DateTime ),
// TimeZone::IsDaylightSavingTime( DateTime, DaylightTime ), and
// TimeZone::ToUniversalTime( DateTime ) methods.
using namespace System;
using namespace System::Globalization;
int main()
{
String^ headFmt = "{0,-22}{1,-10}{2,-10}{3,-10}{4}";
// Get the local time zone and a base local time.
TimeZone^ localZone = TimeZone::CurrentTimeZone;
DateTime localTime = DateTime(2001,1,1);
Console::WriteLine( "This example of \n"
" TimeZone::IsDaylightSavingTime( DateTime ), \n"
" TimeZone::IsDaylightSavingTime( "
"DateTime, DaylightTime* ), and \n"
" TimeZone::ToUniversalTime( DateTime )\n"
"generates the following output, which varies "
"depending on the \ntime zone in which it is run.\n" );
Console::WriteLine( "The example creates several local "
"times and the corresponding \nCoordinated Universal "
"Times (UTC) and shows if they occur in \ndaylight "
"saving time (DST), both for specified years "
"and for \nany year.\n" );
Console::WriteLine( "Local time: {0}\n", localZone->StandardName );
Console::WriteLine( headFmt, "Local Date and Time", "2001 DST?", "2002 DST?", "Any DST?", "Corresponding UTC" );
Console::WriteLine( headFmt, "-------------------", "---------", "---------", "--------", "-----------------" );
// Create DaylightTime objects for specific years.
DaylightTime^ daylight2001 = localZone->GetDaylightChanges( 2001 );
DaylightTime^ daylight2002 = localZone->GetDaylightChanges( 2002 );
// Generate several local times.
for ( int loopX = 0; loopX <= 10; loopX++ )
{
// Calculate the corresponding UTC.
DateTime utcTime = localZone->ToUniversalTime( localTime );
// Show if dates and times occur in daylight saving
// time, for specified years and for any year.
Console::WriteLine( "{0,-22:yyyy-MM-dd HH:mm}"
"{1,-10}{2,-10}{3,-10}{4:yyyy-MM-dd HH:mm}", localTime, TimeZone::IsDaylightSavingTime( localTime, daylight2001 ), TimeZone::IsDaylightSavingTime( localTime, daylight2002 ), localZone->IsDaylightSavingTime( localTime ), utcTime );
// Advance to another local time.
localTime = localTime.AddDays( 109.1 );
}
}
/*
This example of
TimeZone::IsDaylightSavingTime( DateTime ),
TimeZone::IsDaylightSavingTime( DateTime, DaylightTime* ), and
TimeZone::ToUniversalTime( DateTime )
generates the following output, which varies depending on the
time zone in which it is run.
The example creates several local times and the corresponding
Coordinated Universal Times (UTC) and shows if they occur in
daylight saving time (DST), both for specified years and for
any year.
Local time: Pacific Standard Time
Local Date and Time 2001 DST? 2002 DST? Any DST? Corresponding UTC
------------------- --------- --------- -------- -----------------
2001-01-01 00:00 False False False 2001-01-01 08:00
2001-04-20 02:24 True False True 2001-04-20 09:24
2001-08-07 04:48 True False True 2001-08-07 11:48
2001-11-24 07:12 False False False 2001-11-24 15:12
2002-03-13 09:36 False False False 2002-03-13 17:36
2002-06-30 12:00 False True True 2002-06-30 19:00
2002-10-17 14:24 False True True 2002-10-17 21:24
2003-02-03 16:48 False False False 2003-02-04 00:48
2003-05-23 19:12 False False True 2003-05-24 02:12
2003-09-09 21:36 False False True 2003-09-10 04:36
2003-12-28 00:00 False False False 2003-12-28 08:00
*/
// Example of the TimeZone.IsDaylightSavingTime( DateTime ),
// TimeZone.IsDaylightSavingTime( DateTime, DaylightTime ), and
// TimeZone.ToUniversalTime( DateTime ) methods.
import System.*;
import System.Globalization.*;
class DaylightTimeDemo
{
public static void main(String[] args)
{
final String headFmt = "{0,-22}{1,-10}{2,-10}{3,-10}{4}";
// Get the local time zone and a base local time.
TimeZone localZone = TimeZone.get_CurrentTimeZone();
DateTime localTime = new DateTime(2001, 1, 1);
Console.WriteLine(("This example of \n"
+ "TimeZone.IsDaylightSavingTime( DateTime ), \n"
+ "TimeZone.IsDaylightSavingTime( "
+ "DateTime, DaylightTime ), and \n"
+ " TimeZone.ToUniversalTime( DateTime )\n"
+ "generates the following output, which varies "
+ "depending on the \ntime zone in which it is run.\n"));
Console.WriteLine(("The example creates several local "
+ "times and the corresponding \nCoordinated Universal "
+ "Times (UTC) and shows if they occur in \ndaylight "
+ "saving time (DST), both for specified years "
+ "and for \nany year.\n"));
Console.WriteLine("Local time: {0}\n", localZone.get_StandardName());
Console.WriteLine(headFmt, new Object[] {
"Local Date and Time", "2001 DST?", "2002 DST?", "Any DST?",
"Corresponding UTC" });
Console.WriteLine(headFmt, new Object[] { "-------------------",
"---------", "---------", "--------", "-----------------" });
// Create DaylightTime objects for specific years.
DaylightTime daylight2001 = localZone.GetDaylightChanges(2001);
DaylightTime daylight2002 = localZone.GetDaylightChanges(2002);
// Generate several local times.
for (int loopX = 0; loopX <= 10; loopX++) {
// Calculate the corresponding UTC.
DateTime utcTime = localZone.ToUniversalTime(localTime);
// Show if dates and times occur in daylight saving
// time, for specified years and for any year.
Console.WriteLine("{0,-22:yyyy-MM-dd HH:mm}"
+ "{1,-10}{2,-10}{3,-10}{4:yyyy-MM-dd HH:mm}", new Object[]
{ localTime, (System.Boolean)TimeZone.IsDaylightSavingTime(
localTime, daylight2001), (System.Boolean)
TimeZone.IsDaylightSavingTime(localTime, daylight2002),
(System.Boolean)localZone.IsDaylightSavingTime
(localTime), utcTime });
// Advance to another local time.
localTime = localTime.AddDays(109.1);
}
} //main
} //DaylightTimeDemo
/*
This example of
TimeZone.IsDaylightSavingTime( DateTime ),
TimeZone.IsDaylightSavingTime( DateTime, DaylightTime ), and
TimeZone.ToUniversalTime( DateTime )
generates the following output, which varies depending on the
time zone in which it is run.
The example creates several local times and the corresponding
Coordinated Universal Times (UTC) and shows if they occur in
daylight saving time (DST), both for specified years and for
any year.
Local time: Pacific Standard Time
Local Date and Time 2001 DST? 2002 DST? Any DST? Corresponding UTC
------------------- --------- --------- -------- -----------------
2001-01-01 00:00 False False False 2001-01-01 08:00
2001-04-20 02:24 True False True 2001-04-20 09:24
2001-08-07 04:48 True False True 2001-08-07 11:48
2001-11-24 07:12 False False False 2001-11-24 15:12
2002-03-13 09:36 False False False 2002-03-13 17:36
2002-06-30 12:00 False True True 2002-06-30 19:00
2002-10-17 14:24 False True True 2002-10-17 21:24
2003-02-03 16:48 False False False 2003-02-04 00:48
2003-05-23 19:12 False False True 2003-05-24 02:12
2003-09-09 21:36 False False True 2003-09-10 04:36
2003-12-28 00:00 False False False 2003-12-28 08:00
*/
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0
Siehe auch
Referenz
TimeZone-Klasse
TimeZone-Member
System-Namespace
ToLocalTime
GetUtcOffset