DateTime.ToLocalTime Metode
Definisi
Penting
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Mengonversi nilai objek saat ini DateTime ke waktu lokal.
public:
DateTime ToLocalTime();public DateTime ToLocalTime ();member this.ToLocalTime : unit -> DateTimePublic Function ToLocalTime () As DateTimeMengembalikan
Objek yang propertinya Kind adalah Local, dan yang nilainya adalah waktu lokal yang setara dengan nilai objek saat ini DateTime , atau DateTime.MaxValue jika nilai yang dikonversi terlalu besar untuk diwakili oleh DateTime objek, atau DateTime.MinValue jika nilai yang dikonversi terlalu kecil untuk direpresentasikan sebagai DateTime objek.
Contoh
Contoh berikut menunjukkan ToLocalTime metode . Perhatikan bahwa output yang tepat tergantung pada budaya saat ini dan zona waktu lokal sistem tempat sistem dijalankan.
using namespace System;
void main()
{
Console::WriteLine("Enter a date and time.");
String^ strDateTime = Console::ReadLine();
DateTime localDateTime, univDateTime;
try
{
localDateTime = DateTime::Parse(strDateTime);
univDateTime = localDateTime.ToUniversalTime();
Console::WriteLine("{0} local time is {1} universal time.",
localDateTime, univDateTime );
}
catch (FormatException^)
{
Console::WriteLine("Invalid format.");
return;
}
Console::WriteLine("Enter a date and time in universal time.");
strDateTime = Console::ReadLine();
try
{
univDateTime = DateTime::Parse(strDateTime);
localDateTime = univDateTime.ToLocalTime();
Console::WriteLine("{0} universal time is {1} local time.",
univDateTime, localDateTime );
}
catch (FormatException^)
{
Console::WriteLine("Invalid format.");
return;
}
}
// The example displays output like the following when run on a
// computer whose culture is en-US in the Pacific Standard Time zone:
// Enter a date and time.
// 12/10/2015 6:18 AM
// 12/10/2015 6:18:00 AM local time is 12/10/2015 2:18:00 PM universal time.
// Enter a date and time in universal time.
// 12/20/2015 6:42:00
// 12/20/2015 6:42:00 AM universal time is 12/19/2015 10:42:00 PM local time.
open System
printfn "Enter a date and time."
try
let strDateTime = stdin.ReadLine()
let localDateTime = DateTime.Parse strDateTime
let univDateTime = localDateTime.ToUniversalTime()
printfn $"{localDateTime} local time is {univDateTime} universal time."
with :? FormatException ->
printfn "Invalid format."
printfn "Enter a date and time in universal time."
try
let strDateTime = stdin.ReadLine()
let univDateTime = DateTime.Parse strDateTime
let localDateTime = univDateTime.ToLocalTime()
printfn $"{univDateTime} universal time is {localDateTime} local time."
with :? FormatException ->
printfn "Invalid format."
// The example displays output like the following when run on a
// computer whose culture is en-US in the Pacific Standard Time zone:
// Enter a date and time.
// 12/10/2015 6:18 AM
// 12/10/2015 6:18:00 AM local time is 12/10/2015 2:18:00 PM universal time.
// Enter a date and time in universal time.
// 12/20/2015 6:42:00
// 12/20/2015 6:42:00 AM universal time is 12/19/2015 10:42:00 PM local time.
using System;
class Example
{
static void Main()
{
DateTime localDateTime, univDateTime;
Console.WriteLine("Enter a date and time.");
string strDateTime = Console.ReadLine();
try {
localDateTime = DateTime.Parse(strDateTime);
univDateTime = localDateTime.ToUniversalTime();
Console.WriteLine("{0} local time is {1} universal time.",
localDateTime,
univDateTime);
}
catch (FormatException) {
Console.WriteLine("Invalid format.");
return;
}
Console.WriteLine("Enter a date and time in universal time.");
strDateTime = Console.ReadLine();
try {
univDateTime = DateTime.Parse(strDateTime);
localDateTime = univDateTime.ToLocalTime();
Console.WriteLine("{0} universal time is {1} local time.",
univDateTime,
localDateTime);
}
catch (FormatException) {
Console.WriteLine("Invalid format.");
return;
}
}
}
// The example displays output like the following when run on a
// computer whose culture is en-US in the Pacific Standard Time zone:
// Enter a date and time.
// 12/10/2015 6:18 AM
// 12/10/2015 6:18:00 AM local time is 12/10/2015 2:18:00 PM universal time.
// Enter a date and time in universal time.
// 12/20/2015 6:42:00
// 12/20/2015 6:42:00 AM universal time is 12/19/2015 10:42:00 PM local time.
Module Example
Sub Main()
Dim localDateTime, univDateTime As DateTime
Console.WriteLine("Enter a date and time.")
Dim strDateTime As String = Console.ReadLine()
Try
localDateTime = DateTime.Parse(strDateTime)
univDateTime = localDateTime.ToUniversalTime()
Console.WriteLine("{0} local time is {1} universal time.",
localDateTime, univDateTime)
Catch exp As FormatException
Console.WriteLine("Invalid format.")
End Try
Console.WriteLine("Enter a date and time in universal time.")
strDateTime = Console.ReadLine()
Try
univDateTime = DateTime.Parse(strDateTime)
localDateTime = univDateTime.ToLocalTime()
Console.WriteLine("{0} universal time is {1} local time.", _
univDateTime, localDateTime)
Catch exp As FormatException
Console.WriteLine("Invalid format.")
End Try
End Sub
End Module
' The example displays output like the following when run on a
' computer whose culture is en-US in the Pacific Standard Time zone:
' Enter a date and time.
' 12/10/2015 6:18 AM
' 12/10/2015 6:18:00 AM local time is 12/10/2015 2:18:00 PM universal time.
' Enter a date and time in universal time.
' 12/20/2015 6:42:00
' 12/20/2015 6:42:00 AM universal time is 12/19/2015 10:42:00 PM local time.
Contoh berikut menggunakan SpecifyKind metode untuk menunjukkan bagaimana Kind properti memengaruhi ToLocalTime metode konversi dan ToUniversalTime .
// This code example demonstrates the DateTime Kind, Now, and
// UtcNow properties, and the SpecifyKind(), ToLocalTime(),
// and ToUniversalTime() methods.
open System
// Display the value and Kind property of a DateTime structure, the
// DateTime structure converted to local time, and the DateTime
// structure converted to universal time.
let datePatt = @"M/d/yyyy hh:mm:ss tt"
let display title (inputDt: DateTime) =
// Display the original DateTime.
let dispDt = inputDt
let dtString = dispDt.ToString datePatt
printfn $"%s{title} {dtString}, Kind = {dispDt.Kind}"
// Convert inputDt to local time and display the result.
// If inputDt.Kind is DateTimeKind.Utc, the conversion is performed.
// If inputDt.Kind is DateTimeKind.Local, the conversion is not performed.
// If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
// performed as if inputDt was universal time.
let dispDt = inputDt.ToLocalTime()
let dtString = dispDt.ToString datePatt
printfn $" ToLocalTime: {dtString}, Kind = {dispDt.Kind}"
// Convert inputDt to universal time and display the result.
// If inputDt.Kind is DateTimeKind.Utc, the conversion is not performed.
// If inputDt.Kind is DateTimeKind.Local, the conversion is performed.
// If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
// performed as if inputDt was local time.
let dispDt = inputDt.ToUniversalTime()
let dtString = dispDt.ToString datePatt
printfn $" ToUniversalTime: {dtString}, Kind = {dispDt.Kind}\n"
// Display the value and Kind property for DateTime.Now and DateTime.UtcNow.
let displayNow title (inputDt: DateTime) =
let dtString = inputDt.ToString datePatt
printfn $"%s{title} {dtString}, Kind = {inputDt.Kind}"
[<EntryPoint>]
let main _ =
// Get the date and time for the current moment, adjusted
// to the local time zone.
let saveNow = DateTime.Now
// Get the date and time for the current moment expressed
// as coordinated universal time (UTC).
let saveUtcNow = DateTime.UtcNow
// Display the value and Kind property of the current moment
// expressed as UTC and local time.
displayNow "UtcNow: .........." saveUtcNow
displayNow "Now: ............." saveNow
printfn ""
// Change the Kind property of the current moment to
// DateTimeKind.Utc and display the result.
let myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Utc)
display "Utc: ............." myDt
// Change the Kind property of the current moment to
// DateTimeKind.Local and display the result.
let myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Local)
display "Local: ..........." myDt
// Change the Kind property of the current moment to
// DateTimeKind.Unspecified and display the result.
let myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Unspecified)
display "Unspecified: ....." myDt
0
// This code example produces the following results:
//
// UtcNow: .......... 5/6/2005 09:34:42 PM, Kind = Utc
// Now: ............. 5/6/2005 02:34:42 PM, Kind = Local
//
// Utc: ............. 5/6/2005 02:34:42 PM, Kind = Utc
// ToLocalTime: 5/6/2005 07:34:42 AM, Kind = Local
// ToUniversalTime: 5/6/2005 02:34:42 PM, Kind = Utc
//
// Local: ........... 5/6/2005 02:34:42 PM, Kind = Local
// ToLocalTime: 5/6/2005 02:34:42 PM, Kind = Local
// ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc
//
// Unspecified: ..... 5/6/2005 02:34:42 PM, Kind = Unspecified
// ToLocalTime: 5/6/2005 07:34:42 AM, Kind = Local
// ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc
// This code example demonstrates the DateTime Kind, Now, and
// UtcNow properties, and the SpecifyKind(), ToLocalTime(),
// and ToUniversalTime() methods.
using System;
class Sample
{
public static void Main()
{
// Get the date and time for the current moment, adjusted
// to the local time zone.
DateTime saveNow = DateTime.Now;
// Get the date and time for the current moment expressed
// as coordinated universal time (UTC).
DateTime saveUtcNow = DateTime.UtcNow;
DateTime myDt;
// Display the value and Kind property of the current moment
// expressed as UTC and local time.
DisplayNow("UtcNow: ..........", saveUtcNow);
DisplayNow("Now: .............", saveNow);
Console.WriteLine();
// Change the Kind property of the current moment to
// DateTimeKind.Utc and display the result.
myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Utc);
Display("Utc: .............", myDt);
// Change the Kind property of the current moment to
// DateTimeKind.Local and display the result.
myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Local);
Display("Local: ...........", myDt);
// Change the Kind property of the current moment to
// DateTimeKind.Unspecified and display the result.
myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Unspecified);
Display("Unspecified: .....", myDt);
}
// Display the value and Kind property of a DateTime structure, the
// DateTime structure converted to local time, and the DateTime
// structure converted to universal time.
public static string datePatt = @"M/d/yyyy hh:mm:ss tt";
public static void Display(string title, DateTime inputDt)
{
DateTime dispDt = inputDt;
string dtString;
// Display the original DateTime.
dtString = dispDt.ToString(datePatt);
Console.WriteLine("{0} {1}, Kind = {2}",
title, dtString, dispDt.Kind);
// Convert inputDt to local time and display the result.
// If inputDt.Kind is DateTimeKind.Utc, the conversion is performed.
// If inputDt.Kind is DateTimeKind.Local, the conversion is not performed.
// If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
// performed as if inputDt was universal time.
dispDt = inputDt.ToLocalTime();
dtString = dispDt.ToString(datePatt);
Console.WriteLine(" ToLocalTime: {0}, Kind = {1}",
dtString, dispDt.Kind);
// Convert inputDt to universal time and display the result.
// If inputDt.Kind is DateTimeKind.Utc, the conversion is not performed.
// If inputDt.Kind is DateTimeKind.Local, the conversion is performed.
// If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
// performed as if inputDt was local time.
dispDt = inputDt.ToUniversalTime();
dtString = dispDt.ToString(datePatt);
Console.WriteLine(" ToUniversalTime: {0}, Kind = {1}",
dtString, dispDt.Kind);
Console.WriteLine();
}
// Display the value and Kind property for DateTime.Now and DateTime.UtcNow.
public static void DisplayNow(string title, DateTime inputDt)
{
string dtString = inputDt.ToString(datePatt);
Console.WriteLine("{0} {1}, Kind = {2}",
title, dtString, inputDt.Kind);
}
}
/*
This code example produces the following results:
UtcNow: .......... 5/6/2005 09:34:42 PM, Kind = Utc
Now: ............. 5/6/2005 02:34:42 PM, Kind = Local
Utc: ............. 5/6/2005 02:34:42 PM, Kind = Utc
ToLocalTime: 5/6/2005 07:34:42 AM, Kind = Local
ToUniversalTime: 5/6/2005 02:34:42 PM, Kind = Utc
Local: ........... 5/6/2005 02:34:42 PM, Kind = Local
ToLocalTime: 5/6/2005 02:34:42 PM, Kind = Local
ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc
Unspecified: ..... 5/6/2005 02:34:42 PM, Kind = Unspecified
ToLocalTime: 5/6/2005 07:34:42 AM, Kind = Local
ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc
*/
' This code example demonstrates the DateTime Kind, Now, and
' UtcNow properties, and the SpecifyKind(), ToLocalTime(),
' and ToUniversalTime() methods.
Class Sample
Public Shared Sub Main()
' Get the date and time for the current moment, adjusted
' to the local time zone.
Dim saveNow As DateTime = DateTime.Now
' Get the date and time for the current moment expressed
' as coordinated universal time (UTC).
Dim saveUtcNow As DateTime = DateTime.UtcNow
Dim myDt As DateTime
' Display the value and Kind property of the current moment
' expressed as UTC and local time.
DisplayNow("UtcNow: ..........", saveUtcNow)
DisplayNow("Now: .............", saveNow)
Console.WriteLine()
' Change the Kind property of the current moment to
' DateTimeKind.Utc and display the result.
myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Utc)
Display("Utc: .............", myDt)
' Change the Kind property of the current moment to
' DateTimeKind.Local and display the result.
myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Local)
Display("Local: ...........", myDt)
' Change the Kind property of the current moment to
' DateTimeKind.Unspecified and display the result.
myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Unspecified)
Display("Unspecified: .....", myDt)
End Sub
' Display the value and Kind property of a DateTime structure, the
' DateTime structure converted to local time, and the DateTime
' structure converted to universal time.
Public Shared datePatt As String = "M/d/yyyy hh:mm:ss tt"
Public Shared Sub Display(ByVal title As String, ByVal inputDt As DateTime)
Dim dispDt As DateTime = inputDt
Dim dtString As String
' Display the original DateTime.
dtString = dispDt.ToString(datePatt)
Console.WriteLine("{0} {1}, Kind = {2}", title, dtString, dispDt.Kind)
' Convert inputDt to local time and display the result.
' If inputDt.Kind is DateTimeKind.Utc, the conversion is performed.
' If inputDt.Kind is DateTimeKind.Local, the conversion is not performed.
' If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
' performed as if inputDt was universal time.
dispDt = inputDt.ToLocalTime()
dtString = dispDt.ToString(datePatt)
Console.WriteLine(" ToLocalTime: {0}, Kind = {1}", dtString, dispDt.Kind)
' Convert inputDt to universal time and display the result.
' If inputDt.Kind is DateTimeKind.Utc, the conversion is not performed.
' If inputDt.Kind is DateTimeKind.Local, the conversion is performed.
' If inputDt.Kind is DateTimeKind.Unspecified, the conversion is
' performed as if inputDt was local time.
dispDt = inputDt.ToUniversalTime()
dtString = dispDt.ToString(datePatt)
Console.WriteLine(" ToUniversalTime: {0}, Kind = {1}", dtString, dispDt.Kind)
Console.WriteLine()
End Sub
' Display the value and Kind property for DateTime.Now and DateTime.UtcNow.
Public Shared Sub DisplayNow(ByVal title As String, ByVal inputDt As DateTime)
Dim dtString As String = inputDt.ToString(datePatt)
Console.WriteLine("{0} {1}, Kind = {2}", title, dtString, inputDt.Kind)
End Sub
End Class
'
'This code example produces the following results:
'
'UtcNow: .......... 5/6/2005 09:34:42 PM, Kind = Utc
'Now: ............. 5/6/2005 02:34:42 PM, Kind = Local
'
'Utc: ............. 5/6/2005 02:34:42 PM, Kind = Utc
' ToLocalTime: 5/6/2005 07:34:42 AM, Kind = Local
' ToUniversalTime: 5/6/2005 02:34:42 PM, Kind = Utc
'
'Local: ........... 5/6/2005 02:34:42 PM, Kind = Local
' ToLocalTime: 5/6/2005 02:34:42 PM, Kind = Local
' ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc
'
'Unspecified: ..... 5/6/2005 02:34:42 PM, Kind = Unspecified
' ToLocalTime: 5/6/2005 07:34:42 AM, Kind = Local
' ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc
'
Keterangan
Waktu lokal sama dengan waktu Waktu Universal Terkoordinasi (UTC) ditambah offset UTC. Untuk informasi selengkapnya tentang offset UTC, lihat TimeZoneInfo.GetUtcOffset. Konversi juga memperhitungkan aturan waktu musim panas yang berlaku untuk waktu yang diwakili oleh objek saat ini DateTime .
Penting
Pada sistem Windows XP, ToLocalTime metode ini hanya mengenali aturan penyesuaian saat ini saat mengonversi dari UTC ke waktu lokal. Akibatnya, konversi untuk periode sebelum aturan penyesuaian saat ini mulai berlaku mungkin tidak secara akurat mencerminkan perbedaan antara UTC dan waktu lokal.
Dimulai dengan .NET Framework versi 2.0, nilai yang dikembalikan oleh ToLocalTime metode ditentukan oleh Kind properti objek saat iniDateTime. Tabel berikut ini menjelaskan kemungkinan hasilnya.
| Jenis | Hasil |
|---|---|
| Utc | Instans DateTime ini dikonversi ke waktu lokal. |
| Local | Tidak ada konversi yang dilakukan. |
| Unspecified | Instans ini diasumsikan DateTime sebagai waktu UTC, dan konversi dilakukan seolah-olah Kind adalah Utc. |
Catatan
Metode mengonversi ToLocalTimeDateTime nilai dari UTC ke waktu lokal. Untuk mengonversi waktu di zona waktu yang ditunjuk ke waktu lokal, gunakan metode .TimeZoneInfo.ConvertTime
Nilai yang dikembalikan oleh konversi adalah properti DateTime yang Kind selalu mengembalikan Local. Akibatnya, hasil yang valid dikembalikan bahkan jika ToLocalTime diterapkan berulang kali ke yang sama DateTime.
Catatan Bagi Pemanggil
Anda dapat menggunakan ToLocalTime() metode untuk memulihkan nilai tanggal dan waktu lokal yang dikonversi ke UTC dengan ToUniversalTime() metode atau FromFileTimeUtc(Int64) . Namun, jika waktu asli menunjukkan waktu yang tidak valid di zona waktu lokal, waktu tersebut tidak akan cocok dengan nilai yang dipulihkan. ToLocalTime() Ketika metode mengonversi waktu dari UTC ke zona waktu lokal, metode juga menyesuaikan waktu sehingga valid di zona waktu lokal.
Misalnya, transisi dari waktu standar ke waktu musim panas terjadi di zona Waktu Pasifik AS pada 14 Maret 2010, pada pukul 02.00, ketika waktu maju satu jam, ke 3:00 A.M. Interval jam ini adalah waktu yang tidak valid, yaitu interval waktu yang tidak ada di zona waktu ini. Contoh berikut menunjukkan bahwa ketika waktu yang termasuk dalam rentang ini dikonversi ke UTC dengan ToUniversalTime() metode dan kemudian dipulihkan oleh ToLocalTime() metode , nilai asli disesuaikan untuk menjadi waktu yang valid. Anda dapat menentukan apakah nilai tanggal dan waktu tertentu mungkin tunduk pada modifikasi dengan meneruskannya ke IsInvalidTime(DateTime) metode , seperti yang diilustrasikan contoh.
using System;
public class Example
{
public static void Main()
{
DateTime date1 = new DateTime(2010, 3, 14, 2, 30, 0, DateTimeKind.Local);
Console.WriteLine("Invalid time: {0}",
TimeZoneInfo.Local.IsInvalidTime(date1));
DateTime utcDate1 = date1.ToUniversalTime();
DateTime date2 = utcDate1.ToLocalTime();
Console.WriteLine("{0} --> {1}", date1, date2);
}
}
// The example displays the following output:
// Invalid time: True
// 3/14/2010 2:30:00 AM --> 3/14/2010 3:30:00 AM
open System
let date1 = DateTime(2010, 3, 14, 2, 30, 0, DateTimeKind.Local)
printfn $"Invalid time: {TimeZoneInfo.Local.IsInvalidTime date1}"
let utcDate1 = date1.ToUniversalTime()
let date2 = utcDate1.ToLocalTime()
printfn $"{date1} --> {date2}"
// The example displays the following output:
// Invalid time: True
// 3/14/2010 2:30:00 AM --> 3/14/2010 3:30:00 AM
Module Example
Public Sub Main()
Dim date1 As New Date(2010, 3, 14, 2, 30, 0, DateTimeKind.Local)
Console.WriteLine("Invalid time: {0}", _
TimeZoneInfo.Local.IsInvalidTime(date1))
Dim utcDate1 As Date = date1.ToUniversalTime()
Dim date2 As Date = utcDate1.ToLocalTime()
Console.WriteLine("{0} --> {1}", date1, date2)
End Sub
End Module
' The example displays the following output:
' Invalid time: True
' 3/14/2010 2:30:00 AM --> 3/14/2010 3:30:00 AM
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