DaylightTime クラスとは？ わかりやすく解説

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DaylightTime クラス

夏時間の期間を定義します。

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

Visual Basic (宣言)
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class DaylightTime
Visual Basic (使用法)
Dim instance As DaylightTime
C#
[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public class DaylightTime
C++
[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class DaylightTime
J#
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public class DaylightTime
JScript
SerializableAttribute 
ComVisibleAttribute(true) 
public class DaylightTime
解説解説

夏時間とは、1 年のうちで、時計を (通常は 1 時間) 進めて日中時間を多く利用する期間のことです。その期間の終わりに、時間は標準時間に戻されます。

DaylightTime クラスは、System.TimeZone クラスのメンバによって幅広く使用されます。

使用例使用例

TimeZone.GetDaylightChanges メソッドを使用して、選択した年の夏時間の期間とオフセットを返すコード例を次に示します。

Visual Basic
' Example of the TimeZone.GetDaylightChanges( Integer ) method.
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Module DaylightChangesDemo

    ' Get the local time zone and a base local time.
    Dim localZone As TimeZone = TimeZone.CurrentTimeZone

    Sub CreateDaylightTime( year As Integer
 )

        ' Create a DaylightTime object for the specified year.
        Dim daylight As DaylightTime = _
            localZone.GetDaylightChanges( year )

        ' Display the start and end dates and the time change.
        Console.WriteLine( "{0,-7}{1,-20:yyyy-MM-dd HH:mm}"
 & _
            "{2,-20:yyyy-MM-dd HH:mm}{3}", _
            year, daylight.Start, daylight.End, daylight.Delta )
    End Sub 

    Sub Main( )

        Const headFmt As String
 = "{0,-7}{1,-20}{2,-20}{3}"

        Console.WriteLine( _
            "This example of TimeZone.GetDaylightChanges( "
 & _
            "Integer ) generates the " & vbCrLf
 & "following " & _
            "output, which varies depending on the time zone "
 & _
            "in which " & vbCrLf & "it
 is run. The example " & _
            "creates DaylightTime objects for specified "
 & _
            vbCrLf & "years and displays the start and end
 dates " & _
            "and time change for " & vbCrLf &
  "daylight " & _
            "saving time." & vbCrLf )

        ' Write a message explaining that start dates prior to 1986
 
        ' in the en-US culture may not be correct.
        If CultureInfo.CurrentCulture.Name = "en-US"
 Then

            Console.WriteLine( _
                "Note: In the [en-US] culture, all start dates
 " & _
                "are calculated from " & vbCrLf
 & "the first " & _
                "Sunday in April, based on a standard set in "
 & _
                "1986. For " & vbCrLf & "dates
 prior to 1986, " & _
                "the calculated start date may not be accurate."
 )
        End If

        Console.WriteLine( vbCrLf & "Local time: {0}"
 & vbCrLf, _
            localZone.StandardName )

        Console.WriteLine( headFmt, "Year", "Start",
 "End", "Change" )
        Console.WriteLine( headFmt, "----", "-----",
 "---", "------" )

        CreateDaylightTime( 1960 )
        CreateDaylightTime( 1970 )
        CreateDaylightTime( 1980 )
        CreateDaylightTime( 1990 )
        CreateDaylightTime( 2000 )
        CreateDaylightTime( 2001 )
        CreateDaylightTime( 2002 )
        CreateDaylightTime( 2003 )
        CreateDaylightTime( 2004 )
        CreateDaylightTime( 2005 )
        CreateDaylightTime( 2020 )
        CreateDaylightTime( 2040 )
    End Sub 
End Module 

' This example of TimeZone.GetDaylightChanges( Integer ) generates the
' following output, which varies depending on the time zone in which
' it is run. The example creates DaylightTime objects for specified
' years and displays the start and end dates and time change for
' daylight saving time.
' 
' Note: In the [en-US] culture, all start dates are calculated from
' the first Sunday in April, based on a standard set in 1986. For
' dates prior to 1986, the calculated start date may not be accurate.
' 
' Local time: Pacific Standard Time
' 
' Year   Start               End                 Change
' ----   -----               ---                 ------
' 1960   1960-04-03 02:00    1960-10-30 02:00    01:00:00
' 1970   1970-04-05 02:00    1970-10-25 02:00    01:00:00
' 1980   1980-04-06 02:00    1980-10-26 02:00    01:00:00
' 1990   1990-04-01 02:00    1990-10-28 02:00    01:00:00
' 2000   2000-04-02 02:00    2000-10-29 02:00    01:00:00
' 2001   2001-04-01 02:00    2001-10-28 02:00    01:00:00
' 2002   2002-04-07 02:00    2002-10-27 02:00    01:00:00
' 2003   2003-04-06 02:00    2003-10-26 02:00    01:00:00
' 2004   2004-04-04 02:00    2004-10-31 02:00    01:00:00
' 2005   2005-04-03 02:00    2005-10-30 02:00    01:00:00
' 2020   2020-04-05 02:00    2020-10-25 02:00    01:00:00
' 2040   2040-04-01 02:00    2040-10-28 02:00    01:00:00
C#
// Example of the TimeZone.GetDaylightChanges( int ) method.
using System;
using System.Globalization;

class DaylightChangesDemo
{
    // Get the local time zone and a base local time.
    static TimeZone localZone = TimeZone.CurrentTimeZone;

    static void CreateDaylightTime( int
 year )
    {
        // Create a DaylightTime object for the specified year.
        DaylightTime daylight = 
            localZone.GetDaylightChanges( year );

        // Display the start and end dates and the time change.
        Console.WriteLine( "{0,-7}{1,-20:yyyy-MM-dd HH:mm}" +
            "{2,-20:yyyy-MM-dd HH:mm}{3}", 
            year, daylight.Start, daylight.End, daylight.Delta );
    } 

    static void Main( )
    {
        const string headFmt = "{0,-7}{1
,-20}{2,-20}{3}";

        Console.WriteLine(
            "This example of TimeZone.GetDaylightChanges( int
 ) " +
            "generates the \nfollowing output, which varies " +
            "depending on the time zone in which \nit is
 run. The " +
            "example creates DaylightTime objects for specified
 \n" +
            "years and displays the start and end dates and time " +
            "change for \ndaylight saving time.\n" );

        // Write a message explaining that start dates prior to 1986
 
        // in the en-US culture may not be correct.
        if( CultureInfo.CurrentCulture.Name == "en-US"
 )
        {
            Console.WriteLine(
                "Note: In the [en-US] culture, all start dates are " +
                "calculated from \nthe first Sunday in April,
 " +
                "based on a standard set in
 1986. For \ndates " +
                "prior to 1986, the calculated start date may not " +
                "be accurate." );
        }

        Console.WriteLine( "\nLocal time: {0}\n", 
            localZone.StandardName );

        Console.WriteLine( headFmt, "Year", "Start", "End",
 "Change" );
        Console.WriteLine( headFmt, "----", "-----", "---",
 "------" );

        CreateDaylightTime( 1960 );
        CreateDaylightTime( 1970 );
        CreateDaylightTime( 1980 );
        CreateDaylightTime( 1990 );
        CreateDaylightTime( 2000 );
        CreateDaylightTime( 2001 );
        CreateDaylightTime( 2002 );
        CreateDaylightTime( 2003 );
        CreateDaylightTime( 2004 );
        CreateDaylightTime( 2005 );
        CreateDaylightTime( 2020 );
        CreateDaylightTime( 2040 );
    } 
} 

/*
This example of TimeZone.GetDaylightChanges( int ) generates the
following output, which varies depending on the time zone in which
it is run. The example creates DaylightTime objects for specified
years and displays the start and end dates and time change for
daylight saving time.

Note: In the [en-US] culture, all start dates are calculated from
the first Sunday in April, based on a standard set
 in 1986. For
dates prior to 1986, the calculated start date may not be accurate.

Local time: Pacific Standard Time

Year   Start               End                 Change
----   -----               ---                 ------
1960   1960-04-03 02:00    1960-10-30 02:00    01:00:00
1970   1970-04-05 02:00    1970-10-25 02:00    01:00:00
1980   1980-04-06 02:00    1980-10-26 02:00    01:00:00
1990   1990-04-01 02:00    1990-10-28 02:00    01:00:00
2000   2000-04-02 02:00    2000-10-29 02:00    01:00:00
2001   2001-04-01 02:00    2001-10-28 02:00    01:00:00
2002   2002-04-07 02:00    2002-10-27 02:00    01:00:00
2003   2003-04-06 02:00    2003-10-26 02:00    01:00:00
2004   2004-04-04 02:00    2004-10-31 02:00    01:00:00
2005   2005-04-03 02:00    2005-10-30 02:00    01:00:00
2020   2020-04-05 02:00    2020-10-25 02:00    01:00:00
2040   2040-04-01 02:00    2040-10-28 02:00    01:00:00
*/
C++
// Example of the TimeZone::GetDaylightChanges( int ) method.
using namespace System;
using namespace System::Globalization;
void CreateDaylightTime( int year, TimeZone^
 localZone )
{
   
   // Create a DaylightTime object for the specified year.
   DaylightTime^ daylight = localZone->GetDaylightChanges( year );
   
   // Display the start and end dates and the time change.
   Console::WriteLine( "{0,-7}{1,-20:yyyy-MM-dd HH:mm}"
   "{2,-20:yyyy-MM-dd HH:mm}{3}", year, daylight->Start, daylight->End,
 daylight->Delta );
}

int main()
{
   String^ headFmt = "{0,-7}{1,-20}{2,-20}{3}";
   
   // Get the local time zone.
   TimeZone^ localZone = TimeZone::CurrentTimeZone;
   Console::WriteLine( "This example of TimeZone::GetDaylightChanges( int
 ) "
   "generates the \nfollowing output, which varies "
   "depending on the time zone in which \nit is run. The
 "
   "example creates DaylightTime objects for specified \n"
   "years and displays the start and end dates and time "
   "change for \ndaylight saving time.\n" );
   
   // Write a message explaining that start dates prior to 1986 
   // in the en-US culture may not be correct.
   // ( CultureInfo::CurrentCulture->Name == S"en-US" )
 returns False.
   if ( CultureInfo::CurrentCulture->Name->CompareTo( "en-US"
 ) == 0 )
   {
      Console::WriteLine( "Note: In the [en-US] culture, all start dates are
 "
      "calculated from \nthe first Sunday in April, based
 on "
      "a standard set in 1986. For \ndates
 prior to 1986, "
      "the calculated start date may not be accurate." );
   }

   Console::WriteLine( "\nLocal time: {0}\n", localZone->StandardName
 );
   Console::WriteLine( headFmt, "Year", "Start", "End",
 "Change" );
   Console::WriteLine( headFmt, "----", "-----", "---",
 "------" );
   CreateDaylightTime( 1960, localZone );
   CreateDaylightTime( 1970, localZone );
   CreateDaylightTime( 1980, localZone );
   CreateDaylightTime( 1990, localZone );
   CreateDaylightTime( 2000, localZone );
   CreateDaylightTime( 2001, localZone );
   CreateDaylightTime( 2002, localZone );
   CreateDaylightTime( 2003, localZone );
   CreateDaylightTime( 2004, localZone );
   CreateDaylightTime( 2005, localZone );
   CreateDaylightTime( 2020, localZone );
   CreateDaylightTime( 2040, localZone );
}

/*
This example of TimeZone::GetDaylightChanges( int ) generates
 the
following output, which varies depending on the time zone in which
it is run. The example creates DaylightTime objects for specified
years and displays the start and end dates and time change for
daylight saving time.

Note: In the [en-US] culture, all start dates are calculated from
the first Sunday in April, based on a standard set
 in 1986. For
dates prior to 1986, the calculated start date may not be accurate.

Local time: Pacific Standard Time

Year   Start               End                 Change
----   -----               ---                 ------
1960   1960-04-03 02:00    1960-10-30 02:00    01:00:00
1970   1970-04-05 02:00    1970-10-25 02:00    01:00:00
1980   1980-04-06 02:00    1980-10-26 02:00    01:00:00
1990   1990-04-01 02:00    1990-10-28 02:00    01:00:00
2000   2000-04-02 02:00    2000-10-29 02:00    01:00:00
2001   2001-04-01 02:00    2001-10-28 02:00    01:00:00
2002   2002-04-07 02:00    2002-10-27 02:00    01:00:00
2003   2003-04-06 02:00    2003-10-26 02:00    01:00:00
2004   2004-04-04 02:00    2004-10-31 02:00    01:00:00
2005   2005-04-03 02:00    2005-10-30 02:00    01:00:00
2020   2020-04-05 02:00    2020-10-25 02:00    01:00:00
2040   2040-04-01 02:00    2040-10-28 02:00    01:00:00
*/
J#
// Example of the TimeZone.GetDaylightChanges( int ) method.
import System.*;
import System.Globalization.*;

class DaylightChangesDemo
{
    // Get the local time zone and a base local time.
    private static TimeZone localZone = TimeZone.get_CurrentTimeZone();
   
    static void CreateDaylightTime(int
 year) 
    {
        // Create a DaylightTime object for the specified year.
        DaylightTime daylight = localZone.GetDaylightChanges(year);
      
         // Display the start and end dates and the time change.
        Console.WriteLine("{0,-7}{1,-20:yyyy-MM-dd HH:mm}"
            + "{2,-20:yyyy-MM-dd HH:mm}{3}", new Object[]
 {
            (System.Int32)year, daylight.get_Start(), daylight.get_End(),
            daylight.get_Delta() } );
    } //CreateDaylightTime
      
    public static void main(String[]
 args)
    {
        final String headFmt = "{0,-7}{1,-20}{2,-20}{3}";
      
        Console.WriteLine(("This example of TimeZone.GetDaylightChanges( int
 )"
            + " generates the \nfollowing output, which varies "
            + "depending on the time zone in which \nit is
 run. The " 
            + "example creates DaylightTime objects for specified
 \n" 
            + "years and displays the start and end dates and time " 
            + "change for \ndaylight saving time.\n"));
      
        // Write a message explaining that start dates prior to 1986
 
        // in the en-US culture may not be correct.
        if(CultureInfo.get_CurrentCulture().get_Name()
            .equalsIgnoreCase("en-US")) {
                Console.WriteLine(("Note: In the [en-US] culture, all"
                    + " start dates are calculated from \nthe first Sunday in
 April, "
                    + "based on a standard set in
 1986. For \ndates " 
                    + "prior to 1986, the calculated start date may not "
 
                    + "be accurate."));
        }
      
        Console.WriteLine("\nLocal time: {0}\n", localZone.get_StandardName());
        Console.WriteLine(headFmt, new Object[] { "Year",
 "Start", "End",
            "Change" });
        Console.WriteLine(headFmt, new Object[] { "----",
 "-----", "---",
            "------" });
      
        CreateDaylightTime(1960);
        CreateDaylightTime(1970);
        CreateDaylightTime(1980);
        CreateDaylightTime(1990);
        CreateDaylightTime(2000);
        CreateDaylightTime(2001);
        CreateDaylightTime(2002);
        CreateDaylightTime(2003);
        CreateDaylightTime(2004);
        CreateDaylightTime(2005);
        CreateDaylightTime(2020);
        CreateDaylightTime(2040);
    } //main
} //DaylightChangesDemo

/*
This example of TimeZone.GetDaylightChanges( int ) generates the
following output, which varies depending on the time zone in which
it is run. The example creates DaylightTime objects for specified
years and displays the start and end dates and time change for
daylight saving time.

Note: In the [en-US] culture, all start dates are calculated from
the first Sunday in April, based on a standard set
 in 1986. For
dates prior to 1986, the calculated start date may not be accurate.

Local time: Pacific Standard Time

Year   Start               End                 Change
----   -----               ---                 ------
1960   1960-04-03 02:00    1960-10-30 02:00    01:00:00
1970   1970-04-05 02:00    1970-10-25 02:00    01:00:00
1980   1980-04-06 02:00    1980-10-26 02:00    01:00:00
1990   1990-04-01 02:00    1990-10-28 02:00    01:00:00
2000   2000-04-02 02:00    2000-10-29 02:00    01:00:00
2001   2001-04-01 02:00    2001-10-28 02:00    01:00:00
2002   2002-04-07 02:00    2002-10-27 02:00    01:00:00
2003   2003-04-06 02:00    2003-10-26 02:00    01:00:00
2004   2004-04-04 02:00    2004-10-31 02:00    01:00:00
2005   2005-04-03 02:00    2005-10-30 02:00    01:00:00
2020   2020-04-05 02:00    2020-10-25 02:00    01:00:00
2040   2040-04-01 02:00    2040-10-28 02:00    01:00:00
*/
継承階層継承階層
System.Object
  System.Globalization.DaylightTime
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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。

バージョン情報バージョン情報
.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
DaylightTime メンバ
System.Globalization 名前空間
DateTime
TimeSpan
TimeZone

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「DaylightTime クラス」の関連用語

1
DaylightTime プロパティ
.NET Framework クラス ライブラリ リファレンス
76% |||||

2
DaylightTime コンストラクタ
.NET Framework クラス ライブラリ リファレンス
74% |||||

3
DaylightTime メンバ
.NET Framework クラス ライブラリ リファレンス
56% |||||

4
DaylightTime.Start プロパティ
.NET Framework クラス ライブラリ リファレンス
54% |||||

5
DaylightTime.End プロパティ
.NET Framework クラス ライブラリ リファレンス
50% |||||

6
TimeZone.IsDaylightSavingTime メソッド
.NET Framework クラス ライブラリ リファレンス
38% |||||

7
DaylightTime.Delta プロパティ
.NET Framework クラス ライブラリ リファレンス
36% |||||

8
TimeZone.GetDaylightChanges メソッド
.NET Framework クラス ライブラリ リファレンス
36% |||||

9
TimeZone.ToUniversalTime メソッド
.NET Framework クラス ライブラリ リファレンス
36% |||||

10
DaylightTime メソッド
.NET Framework クラス ライブラリ リファレンス
18% |||||

DaylightTime クラスのお隣キーワード

DayRenderEventArgs メソッド

DayRenderEventArgs メンバ

DayRenderEventArgs.Cell プロパティ

DayRenderEventArgs.Day プロパティ

DayRenderEventArgs.SelectUrl プロパティ

DayRenderEventHandler デリゲート

DaylightTime クラス

DaylightTime コンストラクタ

DaylightTime プロパティ

DaylightTime メソッド

DaylightTime メンバ

DaylightTime.Delta プロパティ

DaylightTime.End プロパティ

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