TimeZoneInfo.AdjustmentRule.DateEnd Propriété
Définition
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Obtient la date de fin de la règle d’ajustement.
public:
property DateTime DateEnd { DateTime get(); };public DateTime DateEnd { get; }member this.DateEnd : DateTimePublic ReadOnly Property DateEnd As DateTimeValeur de propriété
Valeur DateTime qui indique la fin de la règle d’ajustement.
Exemples
L’exemple suivant affiche des informations sur tous les fuseaux horaires définis dans le registre système de l’ordinateur local, y compris les dates de début et de fin de leurs règles d’ajustement.
using System;
using System.Collections.ObjectModel;
using System.Globalization;
public class Example
{
public static void Main()
{
ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones();
DateTimeFormatInfo dateInfo = CultureInfo.CurrentCulture.DateTimeFormat;
foreach (var zone in timeZones)
{
Console.WriteLine("{0} transition time information:", zone.StandardName);
Console.WriteLine(" Time zone information: ");
Console.WriteLine(" Base UTC Offset: {0}", zone.BaseUtcOffset);
Console.WriteLine(" Supports DST: {0}", zone.SupportsDaylightSavingTime);
TimeZoneInfo.AdjustmentRule[] adjustmentRules= zone.GetAdjustmentRules();
// Indicate that time zone has no adjustment rules
if (adjustmentRules.Length == 0) {
Console.WriteLine(" No adjustment rules defined.");
}
else {
Console.WriteLine(" Adjustment Rules: {0}", adjustmentRules.Length);
// Iterate adjustment rules
foreach (var adjustmentRule in adjustmentRules) {
Console.WriteLine(" Adjustment rule from {0:d} to {1:d}:",
adjustmentRule.DateStart,
adjustmentRule.DateEnd);
Console.WriteLine(" Delta: {0}", adjustmentRule.DaylightDelta);
// Get start of transition
TimeZoneInfo.TransitionTime daylightStart = adjustmentRule.DaylightTransitionStart;
// Display information on floating date rule
if (! daylightStart.IsFixedDateRule)
Console.WriteLine(" Begins at {0:t} on the {1} {2} of {3}",
daylightStart.TimeOfDay,
(WeekOfMonth) daylightStart.Week,
daylightStart.DayOfWeek,
dateInfo.GetMonthName(daylightStart.Month));
// Display information on fixed date rule
else
Console.WriteLine(" Begins at {0:t} on {1} {2}",
daylightStart.TimeOfDay,
dateInfo.GetMonthName(daylightStart.Month),
daylightStart.Day);
// Get end of transition.
TimeZoneInfo.TransitionTime daylightEnd = adjustmentRule.DaylightTransitionEnd;
// Display information on floating date rule.
if (!daylightEnd.IsFixedDateRule)
Console.WriteLine(" Ends at {0:t} on the {1} {2} of {3}",
daylightEnd.TimeOfDay,
(WeekOfMonth) daylightEnd.Week,
daylightEnd.DayOfWeek,
dateInfo.GetMonthName(daylightEnd.Month));
// Display information on fixed date rule.
else
Console.WriteLine(" Ends at {0:t} on {1} {2}",
daylightEnd.TimeOfDay,
dateInfo.GetMonthName(daylightEnd.Month),
daylightEnd.Day);
}
}
}
}
private enum WeekOfMonth
{
First = 1,
Second = 2,
Third = 3,
Fourth = 4,
Last = 5,
}
}
// A portion of the output from the example might appear as follows:
// Tonga Standard Time transition time information:
// Time zone information:
// Base UTC Offset: 13:00:00
// Supports DST: False
// No adjustment rules defined.
// Samoa Standard Time transition time information:
// Time zone information:
// Base UTC Offset: 13:00:00
// Supports DST: True
// Adjustment Rules: 4
// Adjustment rule from 1/1/0001 to 12/31/2009:
// Delta: 00:00:00
// Begins at 12:00 AM on January 1
// Ends at 12:00 AM on January 1
// Adjustment rule from 1/1/2010 to 12/31/2010:
// Delta: 01:00:00
// Begins at 11:59 PM on the Last Saturday of September
// Ends at 12:00 AM on the First Friday of January
// Adjustment rule from 1/1/2011 to 12/31/2011:
// Delta: 01:00:00
// Begins at 3:00 AM on the Fourth Saturday of September
// Ends at 4:00 AM on the First Saturday of April
// Adjustment rule from 1/1/2012 to 12/31/9999:
// Delta: 01:00:00
// Begins at 12:00 AM on the Last Sunday of September
// Ends at 1:00 AM on the First Sunday of April
// Line Islands Standard Time transition time information:
// Time zone information:
// Base UTC Offset: 14:00:00
// Supports DST: False
// No adjustment rules defined.
open System
open System.Globalization
let timeZones = TimeZoneInfo.GetSystemTimeZones()
let dateInfo = CultureInfo.CurrentCulture.DateTimeFormat
type WeekOfMonth =
| First = 1
| Second = 2
| Third = 3
| Fourth = 4
| Last = 5
for zone in timeZones do
printfn $"{zone.StandardName} transition time information:"
printfn " Time zone information: "
printfn $" Base UTC Offset: {zone.BaseUtcOffset}"
printfn $" Supports DST: {zone.SupportsDaylightSavingTime}"
let adjustmentRules= zone.GetAdjustmentRules()
// Indicate that time zone has no adjustment rules
if adjustmentRules.Length = 0 then
printfn " No adjustment rules defined."
else
printfn $" Adjustment Rules: {adjustmentRules.Length}"
// Iterate adjustment rules
for adjustmentRule in adjustmentRules do
printfn $" Adjustment rule from {adjustmentRule.DateStart:d} to {adjustmentRule.DateEnd:d}:"
printfn $" Delta: {adjustmentRule.DaylightDelta}"
// Get start of transition
let daylightStart = adjustmentRule.DaylightTransitionStart
// Display information on floating date rule
if not daylightStart.IsFixedDateRule then
printfn $" Begins at {daylightStart.TimeOfDay:t} on the {enum<WeekOfMonth> daylightStart.Week} {daylightStart.DayOfWeek} of {dateInfo.GetMonthName daylightStart.Month}"
// Display information on fixed date rule
else
printfn $" Begins at {daylightStart.TimeOfDay:t} on {dateInfo.GetMonthName daylightStart.Month} {daylightStart.Day}"
// Get end of transition.
let daylightEnd = adjustmentRule.DaylightTransitionEnd
// Display information on floating date rule.
if not daylightEnd.IsFixedDateRule then
printfn $" Ends at {daylightEnd.TimeOfDay:t} on the {enum<WeekOfMonth> daylightEnd.Week} {daylightEnd.DayOfWeek} of {dateInfo.GetMonthName daylightEnd.Month}"
// Display information on fixed date rule.
else
printfn $" Ends at {daylightEnd.TimeOfDay:t} on {dateInfo.GetMonthName daylightEnd.Month} {daylightEnd.Day}"
// A portion of the output from the example might appear as follows:
// Tonga Standard Time transition time information:
// Time zone information:
// Base UTC Offset: 13:00:00
// Supports DST: False
// No adjustment rules defined.
// Samoa Standard Time transition time information:
// Time zone information:
// Base UTC Offset: 13:00:00
// Supports DST: True
// Adjustment Rules: 4
// Adjustment rule from 1/1/0001 to 12/31/2009:
// Delta: 00:00:00
// Begins at 12:00 AM on January 1
// Ends at 12:00 AM on January 1
// Adjustment rule from 1/1/2010 to 12/31/2010:
// Delta: 01:00:00
// Begins at 11:59 PM on the Last Saturday of September
// Ends at 12:00 AM on the First Friday of January
// Adjustment rule from 1/1/2011 to 12/31/2011:
// Delta: 01:00:00
// Begins at 3:00 AM on the Fourth Saturday of September
// Ends at 4:00 AM on the First Saturday of April
// Adjustment rule from 1/1/2012 to 12/31/9999:
// Delta: 01:00:00
// Begins at 12:00 AM on the Last Sunday of September
// Ends at 1:00 AM on the First Sunday of April
// Line Islands Standard Time transition time information:
// Time zone information:
// Base UTC Offset: 14:00:00
// Supports DST: False
// No adjustment rules defined.
Imports System.Collections.ObjectModel
Imports System.Globalization
Module Example
Public Sub Main()
Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) = TimeZoneInfo.GetSystemTimeZones()
Dim dateInfo As DateTimeFormatInfo = CultureInfo.CurrentCulture.DateTimeFormat
For Each zone In timeZones
Console.WriteLine("{0} transition time information:", zone.StandardName)
Console.WriteLine(" Time zone information: ")
Console.WriteLine(" Base UTC Offset: {0}", zone.BaseUtcOffset)
Console.WriteLine(" Supports DST: {0}", zone.SupportsDaylightSavingTime)
Dim adjustmentRules() As TimeZoneInfo.AdjustmentRule = zone.GetAdjustmentRules()
' Indicate that time zone has no adjustment rules
If adjustmentRules.Length = 0 Then
Console.WriteLine(" No adjustment rules defined.")
Else
Console.WriteLine(" Adjustment Rules: {0}", adjustmentRules.Length)
' Iterate adjustment rules
For Each adjustmentRule In adjustmentRules
Console.WriteLine(" Adjustment rule from {0:d} to {1:d}:",
adjustmentRule.DateStart,
adjustmentRule.DateEnd)
Console.WriteLine(" Delta: {0}", adjustmentRule.DaylightDelta)
' Get start of transition
Dim daylightStart As TimeZoneInfo.TransitionTime = adjustmentRule.DaylightTransitionStart
' Display information on floating date rule
If Not daylightStart.IsFixedDateRule Then
Console.WriteLine(" Begins at {0:t} on the {1} {2} of {3}",
daylightStart.TimeOfDay,
CType(daylightStart.Week, WeekOfMonth),
daylightStart.DayOfWeek,
dateInfo.GetMonthName(daylightStart.Month))
' Display information on fixed date rule
Else
Console.WriteLine(" Begins at {0:t} on {1} {2}",
daylightStart.TimeOfDay,
dateInfo.GetMonthName(daylightStart.Month),
daylightStart.Day)
End If
' Get end of transition.
Dim daylightEnd As TimeZoneInfo.TransitionTime = adjustmentRule.DaylightTransitionEnd
' Display information on floating date rule.
If Not daylightEnd.IsFixedDateRule Then
Console.WriteLine(" Ends at {0:t} on the {1} {2} of {3}",
daylightEnd.TimeOfDay,
CType(daylightEnd.Week, WeekOfMonth),
daylightEnd.DayOfWeek,
dateInfo.GetMonthName(daylightEnd.Month))
' Display information on fixed date rule.
Else
Console.WriteLine(" Ends at {0:t} on {1} {2}",
daylightEnd.TimeOfDay,
dateInfo.GetMonthName(daylightEnd.Month),
daylightEnd.Day)
End If
Next
End If
Next
End Sub
Private Enum WeekOfMonth As Integer
First = 1
Second = 2
Third = 3
Fourth = 4
Last = 5
End Enum
End Module
' A portion of the output from the example might appear as follows:
' Tonga Standard Time transition time information:
' Time zone information:
' Base UTC Offset: 13:00:00
' Supports DST: False
' No adjustment rules defined.
' Samoa Standard Time transition time information:
' Time zone information:
' Base UTC Offset: 13:00:00
' Supports DST: True
' Adjustment Rules: 4
' Adjustment rule from 1/1/0001 to 12/31/2009:
' Delta: 00:00:00
' Begins at 12:00 AM on January 1
' Ends at 12:00 AM on January 1
' Adjustment rule from 1/1/2010 to 12/31/2010:
' Delta: 01:00:00
' Begins at 11:59 PM on the Last Saturday of September
' Ends at 12:00 AM on the First Friday of January
' Adjustment rule from 1/1/2011 to 12/31/2011:
' Delta: 01:00:00
' Begins at 3:00 AM on the Fourth Saturday of September
' Ends at 4:00 AM on the First Saturday of April
' Adjustment rule from 1/1/2012 to 12/31/9999:
' Delta: 01:00:00
' Begins at 12:00 AM on the Last Sunday of September
' Ends at 1:00 AM on the First Sunday of April
' Line Islands Standard Time transition time information:
' Time zone information:
' Base UTC Offset: 14:00:00
' Supports DST: False
' No adjustment rules defined.
Remarques
La valeur de la DateEnd propriété est une valeur de date sans composant d’heure.
Étant donné que la date de fin de la règle d’ajustement actuelle n’est généralement pas connue, vous pouvez affecter DateTime.MaxValue.Date à la DateEnd propriété lorsque vous créez une règle d’ajustement personnalisée.
Important
Sauf s’il existe une raison convaincante de faire autrement, vous devez définir la date de fin de la règle d’ajustement pour qu’elle se produise dans l’intervalle de temps pendant lequel le fuseau horaire respecte l’heure standard. Sauf s’il existe une raison convaincante de le faire, vous ne devez pas définir la date de fin de la règle d’ajustement pour qu’elle se produise dans l’intervalle de temps pendant lequel le fuseau horaire observe l’heure d’été. Par exemple, si la transition d’un fuseau horaire à partir de l’heure d’été se produit le troisième dimanche de mars et que sa transition vers l’heure d’été se produit le premier dimanche d’octobre, la date de fin effective de la règle d’ajustement ne doit pas être le 31 décembre d’une année donnée, car cette date se produit dans la période de l’heure d’été.
Par défaut, le Registre de Windows XP définit une règle d’ajustement unique dont la date de fin est le vendredi 31 décembre 9999 (la valeur de DateTime.MaxValue.Date), pour chaque fuseau horaire. Pour les fuseaux horaires dans le États-Unis, le Registre dans Windows Vista définit deux règles d’ajustement :
Du lundi 1er janvier 0001 au dimanche 31 décembre 2006.
Du lundi 1er janvier 2007 au vendredi 31 décembre 9999.
Cela signifie que, bien que les règles d’ajustement de fuseau horaire stockées dans le Registre soient utiles pour effectuer des opérations actuelles liées aux fuseaux horaires, elles ne peuvent pas être utilisées de manière fiable pour récupérer des informations de fuseau horaire historique. Pour plus d’informations sur la définition d’un fuseau horaire personnalisé avec plusieurs règles d’ajustement qui peuvent être utilisées dans une application prenant en charge les fuseaux horaires historiques, consultez How to: Create Time Zones with Adjustment Rules.
S’applique à
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