TimeZoneInfo.GetSystemTimeZones Méthode

Source:

TimeZoneInfo.cs

Source:

TimeZoneInfo.cs

Source:

TimeZoneInfo.cs

public:
 static System::Collections::ObjectModel::ReadOnlyCollection<TimeZoneInfo ^> ^ GetSystemTimeZones();

public static System.Collections.ObjectModel.ReadOnlyCollection<TimeZoneInfo> GetSystemTimeZones ();

[System.Security.SecurityCritical]
[System.Security.SecurityTreatAsSafe]
public static System.Collections.ObjectModel.ReadOnlyCollection<TimeZoneInfo> GetSystemTimeZones ();

static member GetSystemTimeZones : unit -> System.Collections.ObjectModel.ReadOnlyCollection<TimeZoneInfo>

[<System.Security.SecurityCritical>]
[<System.Security.SecurityTreatAsSafe>]
static member GetSystemTimeZones : unit -> System.Collections.ObjectModel.ReadOnlyCollection<TimeZoneInfo>

Public Shared Function GetSystemTimeZones () As ReadOnlyCollection(Of TimeZoneInfo)

Retours

Collection d’objets TimeZoneInfo en lecture seule.

Attributs

SecurityCriticalAttribute SecurityTreatAsSafeAttribute

Exceptions

Exemples

L’exemple suivant récupère une collection d’objets de fuseau horaire qui représentent les fuseaux horaires définis sur un ordinateur et écrit des informations les concernant dans un fichier texte.

using System;
using System.Globalization;
using System.IO;
using System.Collections.ObjectModel;

public class Example
{
   public static void Main()
   {
      const string OUTPUTFILENAME = @"C:\Temp\TimeZoneInfo.txt";
   
      DateTimeFormatInfo dateFormats = CultureInfo.CurrentCulture.DateTimeFormat;
      ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones(); 
      StreamWriter sw = new StreamWriter(OUTPUTFILENAME, false);
   
      foreach (TimeZoneInfo timeZone in timeZones)
      {
         bool hasDST = timeZone.SupportsDaylightSavingTime;
         TimeSpan offsetFromUtc = timeZone.BaseUtcOffset;
         TimeZoneInfo.AdjustmentRule[] adjustRules;
         string offsetString;
      
         sw.WriteLine("ID: {0}", timeZone.Id);
         sw.WriteLine("   Display Name: {0, 40}", timeZone.DisplayName);
         sw.WriteLine("   Standard Name: {0, 39}", timeZone.StandardName);
         sw.Write("   Daylight Name: {0, 39}", timeZone.DaylightName);
         sw.Write(hasDST ? "   ***Has " : "   ***Does Not Have ");
         sw.WriteLine("Daylight Saving Time***");
         offsetString = String.Format("{0} hours, {1} minutes", offsetFromUtc.Hours, offsetFromUtc.Minutes);
         sw.WriteLine("   Offset from UTC: {0, 40}", offsetString);
         adjustRules = timeZone.GetAdjustmentRules();
         sw.WriteLine("   Number of adjustment rules: {0, 26}", adjustRules.Length);  
         if (adjustRules.Length > 0)
         {
            sw.WriteLine("   Adjustment Rules:");
            foreach (TimeZoneInfo.AdjustmentRule rule in adjustRules)
            {
               TimeZoneInfo.TransitionTime transTimeStart = rule.DaylightTransitionStart;
               TimeZoneInfo.TransitionTime transTimeEnd = rule.DaylightTransitionEnd; 
            
               sw.WriteLine("      From {0} to {1}", rule.DateStart, rule.DateEnd);
               sw.WriteLine("      Delta: {0}", rule.DaylightDelta);
               if (! transTimeStart.IsFixedDateRule)
               {
                  sw.WriteLine("      Begins at {0:t} on {1} of week {2} of {3}", transTimeStart.TimeOfDay, 
                                                                                transTimeStart.DayOfWeek,                                                                                 
                                                                                transTimeStart.Week, 
                                                                                dateFormats.MonthNames[transTimeStart.Month - 1]);
                  sw.WriteLine("      Ends at {0:t} on {1} of week {2} of {3}", transTimeEnd.TimeOfDay,
                                                                                transTimeEnd.DayOfWeek, 
                                                                                transTimeEnd.Week,
                                                                                dateFormats.MonthNames[transTimeEnd.Month - 1]);
               }
               else
               {
                  sw.WriteLine("      Begins at {0:t} on {1} {2}", transTimeStart.TimeOfDay, 
                                                                 transTimeStart.Day, 
                                                                 dateFormats.MonthNames[transTimeStart.Month - 1]);
                  sw.WriteLine("      Ends at {0:t} on {1} {2}", transTimeEnd.TimeOfDay, 
                                                               transTimeEnd.Day, 
                                                               dateFormats.MonthNames[transTimeEnd.Month - 1]);
               }
            }
         }            
      }
      sw.Close();
   }
}

open System
open System.Globalization
open System.IO
open System.Collections.ObjectModel

[<EntryPoint>]
let main _ =
    let OUTPUTFILENAME = @"C:\Temp\TimeZoneInfo.txt"

    let dateFormats = CultureInfo.CurrentCulture.DateTimeFormat
    let timeZones = TimeZoneInfo.GetSystemTimeZones() 
    use sw = new StreamWriter(OUTPUTFILENAME, false)

    for timeZone in timeZones do
        let hasDST = timeZone.SupportsDaylightSavingTime
        let offsetFromUtc = timeZone.BaseUtcOffset
    
        sw.WriteLine $"ID: {timeZone.Id}"
        sw.WriteLine $"   Display Name: {timeZone.DisplayName, 40}"
        sw.WriteLine $"   Standard Name: {timeZone.StandardName, 39}"
        sw.Write $"   Daylight Name: {timeZone.DaylightName, 39}"
        sw.Write(if hasDST then "   ***Has " else "   ***Does Not Have ")
        sw.WriteLine "Daylight Saving Time***"
        let offsetString = $"{offsetFromUtc.Hours} hours, {offsetFromUtc.Minutes} minutes"
        sw.WriteLine $"   Offset from UTC: {offsetString, 40}"
        let adjustRules = timeZone.GetAdjustmentRules()
        sw.WriteLine $"   Number of adjustment rules: {adjustRules.Length, 26}"
        if adjustRules.Length > 0 then
            sw.WriteLine "   Adjustment Rules:"
            for rule in adjustRules do
                let transTimeStart = rule.DaylightTransitionStart
                let transTimeEnd = rule.DaylightTransitionEnd 
            
                sw.WriteLine $"      From {rule.DateStart} to {rule.DateEnd}"
                sw.WriteLine $"      Delta: {rule.DaylightDelta}"
                if not transTimeStart.IsFixedDateRule then
                    sw.WriteLine $"      Begins at {transTimeStart.TimeOfDay:t} on {transTimeStart.DayOfWeek} of week {transTimeStart.Week} of {dateFormats.MonthNames[transTimeStart.Month - 1]}"
                    sw.WriteLine $"      Ends at {transTimeEnd.TimeOfDay:t} on {transTimeEnd.DayOfWeek} of week {transTimeEnd.Week} of {dateFormats.MonthNames[transTimeEnd.Month - 1]}"
                else
                    sw.WriteLine $"      Begins at {transTimeStart.TimeOfDay:t} on {transTimeStart.Day} {dateFormats.MonthNames[transTimeStart.Month - 1]}"
                    sw.WriteLine $"      Ends at {transTimeEnd.TimeOfDay:t} on {transTimeEnd.Day} {dateFormats.MonthNames[transTimeEnd.Month - 1]}"
    0

Imports System.Collections.ObjectModel
Imports System.Globalization
Imports System.IO

Module Example
   Public Sub Main()
      Const OUTPUTFILENAME As String = "C:\Temp\TimeZoneInfo.txt"
      
      Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) = TimeZoneInfo.GetSystemTimeZones() 
      Dim sw As StreamWriter = New StreamWriter(OUTPUTFILENAME, False)
      
      For Each timeZone As TimeZoneInfo in timeZones
         Dim hasDST As Boolean = timeZone.SupportsDaylightSavingTime
         Dim offsetFromUtc As TimeSpan = timeZone.BaseUtcOffset
         Dim adjustRules() As System.TimeZoneInfo.AdjustmentRule
         Dim offsetString As String
         
         sw.WriteLine("ID: {0}", timeZone.Id)
         sw.WriteLine("   Display Name: {0, 40}", timeZone.DisplayName)
         sw.WriteLine("   Standard Name: {0, 39}", timeZone.StandardName)
         sw.Write("   Daylight Name: {0, 39}", timeZone.DaylightName)
         sw.Write(iif(hasDST, "   ***Has ", "   ***Does Not Have "))
         sw.WriteLine("Daylight Saving Time***")
         offsetString = String.Format("{0} hours, {1} minutes", offsetFromUtc.Hours, offsetFromUtc.Minutes)
         sw.WriteLine("   Offset from UTC: {0, 40}", offsetString)
         adjustRules = timeZone.GetAdjustmentRules()
         sw.WriteLine("   Number of adjustment rules: {0, 26}", adjustRules.Length)  
         If adjustRules.Length > 0 Then
            sw.WriteLine("   Adjustment Rules:")
            For Each rule As TimeZoneInfo.AdjustmentRule In adjustRules
               Dim transTimeStart As TimeZoneInfo.TransitionTime = rule.DaylightTransitionStart
               Dim transTimeEnd As TimeZoneInfo.TransitionTime = rule.DaylightTransitionEnd 
               
               sw.WriteLine("      From {0} to {1}", rule.DateStart, rule.DateEnd)
               sw.WriteLine("      Delta: {0}", rule.DaylightDelta)
               If Not transTimeStart.IsFixedDateRule
                  sw.WriteLine("      Begins at {0:t} on {1} of week {2} of {3}", transTimeStart.TimeOfDay, _
                                                                                transTimeStart.DayOfWeek, _
                                                                                transTimeStart.Week, _
                                                                                MonthName(transTimeStart.Month))
                  sw.WriteLine("      Ends at {0:t} on {1} of week {2} of {3}", transTimeEnd.TimeOfDay, _
                                                                                transTimeEnd.DayOfWeek, _
                                                                                transTimeEnd.Week, _
                                                                                MonthName(transTimeEnd.Month))
               Else
                  sw.WriteLine("      Begins at {0:t} on {1} {2}", transTimeStart.TimeOfDay, _
                                                                 transTimeStart.Day, _
                                                                 MonthName(transTimeStart.Month))
                  sw.WriteLine("      Ends at {0:t} on {1} {2}", transTimeEnd.TimeOfDay, _
                                                               transTimeEnd.Day, _
                                                               MonthName(transTimeEnd.Month))
               End If
            Next
         End If            
      Next
      sw.Close()

#  Get timezone/date details and open a stream writer
$DateFormats    = [System.Globalization.CultureInfo]::CurrentCulture.DateTimeFormat
$TimeZones      = [System.TimeZoneInfo]::GetSystemTimeZones()
$OutputFileName = 'C:\Temp\TimeZoneInfo.txt'
$Sw             = New-Object -TypeName System.IO.StreamWriter -ArgumentList $OutputFileName,$false
# Write overview information
$Sw.WriteLine('{0} Time zones on this system' -f $TimeZones.Count)

# Process each timezone on the system
# Write details to the streamwriter
foreach ($TimeZone in $TimeZones) {
 $HasDST        = $TimeZone.SupportsDaylightSavingTime
 $OffsetFromUtc = $TimeZone.BaseUtcOffset
 $Sw.WriteLine("ID: {0}" -f $TimeZone.Id)
 $Sw.WriteLine("   Display Name:  {0}" -f $TimeZone.DisplayName)
 $Sw.WriteLine("   Standard Name: {0}" -f $TimeZone.StandardName)
 $Sw.Write("   Daylight Name: {0}" -f $TimeZone.DaylightName)
 $Sw.Write( $(If ($HasDST) {"  ***Has: "} Else {"  ***Does Not Have: "}))
 $Sw.WriteLine("Daylight Saving Time***")
 $OffsetString = "{0} hours, {1} minutes" -f $OffsetFromUtc.Hours, $OffsetFromUtc.Minutes
 $Sw.WriteLine("   Offset from UTC: {0}"  -f $offsetString)
 $AdjustRules = $timeZone.GetAdjustmentRules()
 $Sw.WriteLine("   Number of adjustment rules: {0}" -f $adjustRules.Count)
 If ($AdjustRules.Count -gt 0)
 {
    $Sw.WriteLine("   Adjustment Rules:")
    foreach ($Rule in $AdjustRules)
    {
       $TransTimeStart = $Rule.DaylightTransitionStart
       $TransTimeEnd   = $Rule.DaylightTransitionEnd
       $Sw.WriteLine(("     From   {0} to {1}" -f $Rule.DateStart, $Rule.DateEnd))
       $Sw.WriteLine(("       Delta: {0}" -f $Rule.DaylightDelta))
       if (-Not  $TransTimeStart.IsFixedDateRule)
       {
          $Sw.WriteLine(("       Begins at {0:t} on {1} of week {2} of {3}" -f $TransTimeStart.TimeOfDay, 
                                                                             $TransTimeStart.DayOfWeek,                                                                                 
                                                                             $TransTimeStart.Week, 
                                                                             $DateFormats.MonthNames[$TransTimeStart.Month - 1]))
          $Sw.WriteLine(("       Ends at {0:t} on {1} of week {2} of {3}" -f $TransTimeEnd.TimeOfDay,
                                                                             $TransTimeEnd.DayOfWeek, 
                                                                             $TransTimeEnd.Week,
                                                                             $DateFormats.MonthNames[[int] $TransTimeEnd.Month - 1]))
       }
     else
       {
         $Sw.WriteLine(("       Begins at {0:t} on {1} {2}" -f $TransTimeStart.TimeOfDay, 
                                                             $TransTimeStart.Day, 
                                                             $DateFormats.MonthNames[$transTimeStart.Month - 1]))
         $Sw.WriteLine(("       Ends at {0:t} on {1} {2}"   -f $TransTimeEnd.TimeOfDay, 
                                                             $TransTimeEnd.Day, 
                                                             $DateFormats.MonthNames[$transTimeEnd.Month - 1]))        
       }
    } # End of processing each adjustment rule
 } # End of checking adjustment rules
} # End of processing Time Zones

# Close stream writer then display output in notepad
$Sw.Close() 

#  Output of 1st three time zones:
#  135 Time zones on this system
#  ID: Dateline Standard Time
#     Display Name:  (UTC-12:00) International Date Line West
#     Standard Name: Dateline Standard Time
#     Daylight Name: Dateline Summer Time  ***Does Not Have: Daylight Saving Time***
#     Offset from UTC: -12 hours, 0 minutes
#     Number of adjustment rules: 0
#  ID: UTC-11
#     Display Name:  (UTC-11:00) Co-ordinated Universal Time-11
#     Standard Name: UTC-11
#     Daylight Name: UTC-11  ***Does Not Have: Daylight Saving Time***
#     Offset from UTC: -11 hours, 0 minutes
#     Number of adjustment rules: 0
#  ID: Aleutian Standard Time
#     Display Name:  (UTC-10:00) Aleutian Islands
#     Standard Name: Aleutian Standard Time
#     Daylight Name: Aleutian Summer Time  ***Has: Daylight Saving Time***
#     Offset from UTC: -10 hours, 0 minutes
#     Number of adjustment rules: 2
#     Adjustment Rules:
#       From   01/01/0001 00:00:00 to 31/12/2006 00:00:00
#         Delta: 01:00:00
#         Begins at 02:00 on Sunday of week 1 of April
#         Ends at 02:00 on Sunday of week 5 of October
#       From   01/01/2007 00:00:00 to 31/12/9999 00:00:00
#         Delta: 01:00:00
#         Begins at 02:00 on Sunday of week 2 of March
#         Ends at 02:00 on Sunday of week 1 of November

Remarques

La GetSystemTimeZones méthode récupère toutes les informations de fuseau horaire disponibles à partir des sous-clés de la clé HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Time Zones du Registre sur les systèmes Windows et de la bibliothèque iCU sur Linux et macOS. Si elle ne parvient pas à récupérer et à analyser correctement des valeurs pour des propriétés de chaîne particulières d’objets individuels TimeZoneInfo , cette méthode définit leur valeur sur une chaîne vide («  »).

La collection retournée par cette méthode est triée par décalage UTC et, pour les fuseaux horaires qui ont le même décalage UTC, par nom complet à l’aide de la culture actuelle. Pour plus d’informations sur le nom complet, consultez DisplayName.

L’objet ReadOnlyCollection<T> retourné par cette méthode prend en charge l’interface IEnumerable<T> , ce qui signifie qu’il peut être itéré à l’aide des foreach instructions (en C#) ou For Each…Next (en Visual Basic). Chaque itération de la boucle fournit l’objet suivant TimeZoneInfo dans la collection.

La collection d’objets représente les TimeZoneInfo fuseaux horaires définis sur l’ordinateur local; elle ne fournit pas nécessairement d’informations complètes pour tous les fuseaux horaires pendant toutes les périodes. Si votre application nécessite des fuseaux horaires introuvables sur l’ordinateur local, vous pouvez créer des fuseaux horaires personnalisés à l’aide des surcharges de la CreateCustomTimeZone méthode . Pour plus d’informations, consultez Guide pratique pour créer des fuseaux horaires sans règles d’ajustement et Guide pratique pour créer des fuseaux horaires avec des règles d’ajustement.

Vous pouvez également déterminer si un fuseau horaire individuel est défini sur l’ordinateur local en appelant la FindSystemTimeZoneById méthode et en fournissant l’identificateur du fuseau horaire que vous souhaitez récupérer en tant que paramètre.

Source:

TimeZoneInfo.cs

Source:

TimeZoneInfo.cs

public:
 static System::Collections::ObjectModel::ReadOnlyCollection<TimeZoneInfo ^> ^ GetSystemTimeZones(bool skipSorting);

public static System.Collections.ObjectModel.ReadOnlyCollection<TimeZoneInfo> GetSystemTimeZones (bool skipSorting);

static member GetSystemTimeZones : bool -> System.Collections.ObjectModel.ReadOnlyCollection<TimeZoneInfo>

Public Shared Function GetSystemTimeZones (skipSorting As Boolean) As ReadOnlyCollection(Of TimeZoneInfo)

Paramètres

Retours

Remarques

En définissant le paramètre skipSorting sur true, la méthode tente d’éviter de trier la collection retournée. Cette option peut être utile lorsque l’appelant ne nécessite pas de liste triée et vise à améliorer les performances.