TimeZone.ToUniversalTime メソッドとは？ わかりやすく解説

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TimeZone.ToUniversalTime メソッド

指定した現地時間に対応する世界協定時刻 (UTC: Coordinated Universal Time) を返します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Visual Basic (宣言)
Public Overridable Function
 ToUniversalTime ( _
    time As DateTime _
) As DateTime
Visual Basic (使用法)
Dim instance As TimeZone
Dim time As DateTime
Dim returnValue As DateTime

returnValue = instance.ToUniversalTime(time)
C#
public virtual DateTime ToUniversalTime (
    DateTime time
)
C++
public:
virtual DateTime ToUniversalTime (
    DateTime time
)
J#
public DateTime ToUniversalTime (
    DateTime time
)
JScript
public function ToUniversalTime (
    time : DateTime
) : DateTime

パラメータ

time

現地の日付と時刻。

戻り値
time に対応する UTC 時間の値を持つ DateTime インスタンス。

解説解説

世界協定時刻 (UTC: Coordinated Universal Time) は、以前はグリニッジ標準時 (GMT: Greenwich Mean Time) と呼ばれていました。現地時間は、使用しているコンピュータの日付と時刻になります。オフセットとは、現地時間と UTC 間の時差です。つまり、次の式で求められます。

UTC = 現地時間 - オフセット

使用例使用例

ToUniversalTime メソッドを使用して、選択した現地時間に対応する UTC 時間を返すコード例を次に示します。

Visual Basic
' 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
C#
// 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
*/
C++
// 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
*/
J#
// 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
*/
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開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

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.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0
参照参照
関連項目
TimeZone クラス
TimeZone メンバ
System 名前空間
ToLocalTime
GetUtcOffset

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TimeZone.ToUniversalTime メソッドのお隣キーワード

TimeZone.DaylightName プロパティ

TimeZone.GetDaylightChanges メソッド

TimeZone.GetUtcOffset メソッド

TimeZone.IsDaylightSavingTime メソッド

TimeZone.StandardName プロパティ

TimeZone.ToLocalTime メソッド

TimeZone.ToUniversalTime メソッド

TitleFormat 列挙体

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TitleStyle クラス

TitleStyle コンストラクタ

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