共用方式為


TimeZoneInfo.ConvertTimeToUtc 方法

定義

將日期和時間轉換為國際標準時間 (UTC)。

多載

ConvertTimeToUtc(DateTime)

將指定的日期和時間轉換為國際標準時間 (UTC)。

ConvertTimeToUtc(DateTime, TimeZoneInfo)

將指定時區的時間轉換為國際標準時間 (UTC)。

ConvertTimeToUtc(DateTime)

來源:
TimeZoneInfo.cs
來源:
TimeZoneInfo.cs
來源:
TimeZoneInfo.cs

將指定的日期和時間轉換為國際標準時間 (UTC)。

public:
 static DateTime ConvertTimeToUtc(DateTime dateTime);
public static DateTime ConvertTimeToUtc (DateTime dateTime);
static member ConvertTimeToUtc : DateTime -> DateTime
Public Shared Function ConvertTimeToUtc (dateTime As DateTime) As DateTime

參數

dateTime
DateTime

要轉換的日期和時間。

傳回

對應至 dateTime 參數的國際標準時間 (UTC)。 DateTime 值的 Kind 屬性始終設定為 Utc

例外狀況

TimeZoneInfo.Local.IsInvalidDateTime( dateTime ) 會傳回 true

範例

下列範例說明分別其 Kind 屬性為 DateTimeKind.UtcDateTimeKind.LocalDateTimeKind.Unspecified 的時間值轉換。 它也說明模棱兩可且不正確轉換。

DateTime datNowLocal = DateTime.Now;
Console.WriteLine("Converting {0}, Kind {1}:", datNowLocal, datNowLocal.Kind);
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNowLocal), TimeZoneInfo.ConvertTimeToUtc(datNowLocal).Kind);
Console.WriteLine();

DateTime datNowUtc = DateTime.UtcNow;
Console.WriteLine("Converting {0}, Kind {1}", datNowUtc, datNowUtc.Kind);
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNowUtc), TimeZoneInfo.ConvertTimeToUtc(datNowUtc).Kind);
Console.WriteLine();

DateTime datNow = new DateTime(2007, 10, 26, 13, 32, 00);
Console.WriteLine("Converting {0}, Kind {1}", datNow, datNow.Kind);
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNow), TimeZoneInfo.ConvertTimeToUtc(datNow).Kind);
Console.WriteLine();

DateTime datAmbiguous = new DateTime(2007, 11, 4, 1, 30, 00);    
Console.WriteLine("Converting {0}, Kind {1}, Ambiguous {2}", datAmbiguous, datAmbiguous.Kind, TimeZoneInfo.Local.IsAmbiguousTime(datAmbiguous));
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datAmbiguous), TimeZoneInfo.ConvertTimeToUtc(datAmbiguous).Kind);
Console.WriteLine();

DateTime datInvalid = new DateTime(2007, 3, 11, 02, 30, 00);    
Console.WriteLine("Converting {0}, Kind {1}, Invalid {2}", datInvalid, datInvalid.Kind, TimeZoneInfo.Local.IsInvalidTime(datInvalid));
try
{
   Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datInvalid), TimeZoneInfo.ConvertTimeToUtc(datInvalid).Kind);
}
catch (ArgumentException e)
{   
   Console.WriteLine("   {0}: Cannot convert {1} to UTC.", e.GetType().Name, datInvalid);
}
Console.WriteLine();

DateTime datNearMax = new DateTime(9999, 12, 31, 22, 00, 00);
Console.WriteLine("Converting {0}, Kind {1}", datNearMax, datNearMax.Kind);
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNearMax), TimeZoneInfo.ConvertTimeToUtc(datNearMax).Kind);
Console.WriteLine();
//
// This example produces the following output if the local time zone 
// is Pacific Standard Time:
//
//    Converting 8/31/2007 2:26:28 PM, Kind Local:
//       ConvertTimeToUtc: 8/31/2007 9:26:28 PM, Kind Utc
//    
//    Converting 8/31/2007 9:26:28 PM, Kind Utc
//       ConvertTimeToUtc: 8/31/2007 9:26:28 PM, Kind Utc
//    
//    Converting 10/26/2007 1:32:00 PM, Kind Unspecified
//       ConvertTimeToUtc: 10/26/2007 8:32:00 PM, Kind Utc
//    
//    Converting 11/4/2007 1:30:00 AM, Kind Unspecified, Ambiguous True
//       ConvertTimeToUtc: 11/4/2007 9:30:00 AM, Kind Utc
//    
//    Converting 3/11/2007 2:30:00 AM, Kind Unspecified, Invalid True
//       ArgumentException: Cannot convert 3/11/2007 2:30:00 AM to UTC.
//    
//    Converting 12/31/9999 10:00:00 PM, Kind Unspecified
//       ConvertTimeToUtc: 12/31/9999 11:59:59 PM, Kind Utc
//
let datNowLocal = DateTime.Now
printfn $"Converting {datNowLocal}, Kind {datNowLocal.Kind}:"
printfn $"   ConvertTimeToUtc: {TimeZoneInfo.ConvertTimeToUtc datNowLocal}, Kind {TimeZoneInfo.ConvertTimeToUtc(datNowLocal).Kind}\n"

let datNowUtc = DateTime.UtcNow
printfn $"Converting {datNowUtc}, Kind {datNowUtc.Kind}"
printfn $"   ConvertTimeToUtc: {TimeZoneInfo.ConvertTimeToUtc datNowUtc}, Kind {TimeZoneInfo.ConvertTimeToUtc(datNowUtc).Kind}\n"

let datNow = DateTime(2007, 10, 26, 13, 32, 00)
printfn $"Converting {datNow}, Kind {datNow.Kind}"
printfn $"   ConvertTimeToUtc: {TimeZoneInfo.ConvertTimeToUtc datNow}, Kind {TimeZoneInfo.ConvertTimeToUtc(datNow).Kind}\n"

let datAmbiguous = DateTime(2007, 11, 4, 1, 30, 00)
printfn $"Converting {datAmbiguous}, Kind {datAmbiguous.Kind}, Ambiguous {TimeZoneInfo.Local.IsAmbiguousTime datAmbiguous}"
printfn $"   ConvertTimeToUtc: {TimeZoneInfo.ConvertTimeToUtc datAmbiguous}, Kind {TimeZoneInfo.ConvertTimeToUtc(datAmbiguous).Kind}\n"

let datInvalid = DateTime(2007, 3, 11, 02, 30, 00)    
printfn $"Converting {datInvalid}, Kind {datInvalid.Kind}, Invalid {TimeZoneInfo.Local.IsInvalidTime datInvalid}"
try
    printfn $"   ConvertTimeToUtc: {TimeZoneInfo.ConvertTimeToUtc datInvalid}, Kind {TimeZoneInfo.ConvertTimeToUtc(datInvalid).Kind}"
with :? ArgumentException as e ->
    printfn $"   {e.GetType().Name}: Cannot convert {datInvalid} to UTC."
printfn ""

let datNearMax = DateTime(9999, 12, 31, 22, 00, 00)
printfn $"Converting {datNearMax}, Kind {datNearMax.Kind}"
printfn $"   ConvertTimeToUtc: {TimeZoneInfo.ConvertTimeToUtc datNearMax}, Kind {TimeZoneInfo.ConvertTimeToUtc(datNearMax).Kind}\n"
//
// This example produces the following output if the local time zone 
// is Pacific Standard Time:
//
//    Converting 8/31/2007 2:26:28 PM, Kind Local:
//       ConvertTimeToUtc: 8/31/2007 9:26:28 PM, Kind Utc
//    
//    Converting 8/31/2007 9:26:28 PM, Kind Utc
//       ConvertTimeToUtc: 8/31/2007 9:26:28 PM, Kind Utc
//    
//    Converting 10/26/2007 1:32:00 PM, Kind Unspecified
//       ConvertTimeToUtc: 10/26/2007 8:32:00 PM, Kind Utc
//    
//    Converting 11/4/2007 1:30:00 AM, Kind Unspecified, Ambiguous True
//       ConvertTimeToUtc: 11/4/2007 9:30:00 AM, Kind Utc
//    
//    Converting 3/11/2007 2:30:00 AM, Kind Unspecified, Invalid True
//       ArgumentException: Cannot convert 3/11/2007 2:30:00 AM to UTC.
//    
//    Converting 12/31/9999 10:00:00 PM, Kind Unspecified
//       ConvertTimeToUtc: 12/31/9999 11:59:59 PM, Kind Utc
//
Dim datNowLocal As Date = Date.Now
Console.WriteLine("Converting {0}, Kind {1}:", datNowLocal, datNowLocal.Kind)
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNowLocal), TimeZoneInfo.ConvertTimeToUtc(datNowLocal).Kind)
Console.WriteLine()

Dim datNowUtc As Date = Date.UtcNow
Console.WriteLine("Converting {0}, Kind {1}", datNowUtc, datNowUtc.Kind)
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNowUtc), TimeZoneInfo.ConvertTimeToUtc(datNowUtc).Kind)
Console.WriteLine()

Dim datNow As Date = CDate("10/26/2007 1:32:00 PM")
Console.WriteLine("Converting {0}, Kind {1}", datNow, datNow.Kind)
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNow), TimeZoneInfo.ConvertTimeToUtc(datNow).Kind)
Console.WriteLine()

Dim datAmbiguous As Date = #11/4/2007 1:30:00AM#    
Console.WriteLine("Converting {0}, Kind {1}, Ambiguous {2}", datAmbiguous, datAmbiguous.Kind, TimeZoneInfo.Local.IsAmbiguousTime(datAmbiguous))
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datAmbiguous), TimeZoneInfo.ConvertTimeToUtc(datAmbiguous).Kind)
Console.WriteLine()

Dim datInvalid As Date = #03/11/2007 2:30:00AM#    
Console.WriteLine("Converting {0}, Kind {1}, Invalid {2}", datInvalid, datInvalid.Kind, TimeZoneInfo.Local.IsInvalidTime(datInvalid))
Try
   Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datInvalid), TimeZoneInfo.ConvertTimeToUtc(datInvalid).Kind)
Catch e As ArgumentException
   Console.WriteLine("   {0}: Cannot convert {1} to UTC.", e.GetType().Name, datInvalid)
End Try
Console.WriteLine()

Dim datNearMax As Date = #12/31/9999 10:00:00PM#
Console.WriteLine("Converting {0}, Kind {1}", datNearMax, datNearMax.Kind)
Console.WriteLine("   ConvertTimeToUtc: {0}, Kind {1}", TimeZoneInfo.ConvertTimeToUtc(datNearMax), TimeZoneInfo.ConvertTimeToUtc(datNearMax).Kind)
Console.WriteLine()
'
' This example produces the following output if the local time zone 
' is Pacific Standard Time:
'
'    Converting 8/31/2007 2:26:28 PM, Kind Local:
'       ConvertTimeToUtc: 8/31/2007 9:26:28 PM, Kind Utc
'    
'    Converting 8/31/2007 9:26:28 PM, Kind Utc
'       ConvertTimeToUtc: 8/31/2007 9:26:28 PM, Kind Utc
'    
'    Converting 10/26/2007 1:32:00 PM, Kind Unspecified
'       ConvertTimeToUtc: 10/26/2007 8:32:00 PM, Kind Utc
'    
'    Converting 11/4/2007 1:30:00 AM, Kind Unspecified, Ambiguous True
'       ConvertTimeToUtc: 11/4/2007 9:30:00 AM, Kind Utc
'    
'    Converting 3/11/2007 2:30:00 AM, Kind Unspecified, Invalid True
'       ArgumentException: Cannot convert 3/11/2007 2:30:00 AM to UTC.
'    
'    Converting 12/31/9999 10:00:00 PM, Kind Unspecified
'       ConvertTimeToUtc: 12/31/9999 11:59:59 PM, Kind Utc

備註

所執行的確切轉換取決於 參數的 KinddateTime 屬性值,如下表所示。

DateTime.Kind 屬性 轉換
DateTimeKind.Local 從當地時間轉換為國際標準時間 (UTC) 。
DateTimeKind.Unspecified dateTime假設是當地時間,並從當地時間轉換為 UTC。
DateTimeKind.Utc dateTime傳回未變更。

如果 dateTime 對應至模棱兩可的當地時間,則這個方法會假設它是標準當地時間。 如果 dateTime 對應至不正確當地時間,方法會擲回 ArgumentException

注意

如果目前電腦的當地時區包含多個調整規則,此方法的 ConvertTimeToUtc 這個多載可能會傳回與 和 DateTime.ToUniversalTime 方法不同的 TimeZone.ToUniversalTime 結果。 TimeZone.ToUniversalTime 一律會將目前的調整規則套用至時區轉換,不論 dateTime 是否位於其日期範圍內。 此外,在 .NET Framework 3.5 上執行時, DateTime.ToUniversalTime 也會將目前的調整規則套用至時區轉換,不論 dateTime 是否位於其日期範圍內。

如果 的 dateTime UTC 對等專案早于 DateTime.MinValue 或更新版本, DateTime.MaxValue 則這個方法會分別傳 MinValue 回 或 MaxValue

另請參閱

適用於

ConvertTimeToUtc(DateTime, TimeZoneInfo)

來源:
TimeZoneInfo.cs
來源:
TimeZoneInfo.cs
來源:
TimeZoneInfo.cs

將指定時區的時間轉換為國際標準時間 (UTC)。

public:
 static DateTime ConvertTimeToUtc(DateTime dateTime, TimeZoneInfo ^ sourceTimeZone);
public static DateTime ConvertTimeToUtc (DateTime dateTime, TimeZoneInfo sourceTimeZone);
static member ConvertTimeToUtc : DateTime * TimeZoneInfo -> DateTime
Public Shared Function ConvertTimeToUtc (dateTime As DateTime, sourceTimeZone As TimeZoneInfo) As DateTime

參數

dateTime
DateTime

要轉換的日期和時間。

sourceTimeZone
TimeZoneInfo

dateTime 的時區。

傳回

對應至 dateTime 參數的國際標準時間 (UTC)。 DateTime 物件的 Kind 屬性始終設定為 Utc

例外狀況

dateTime. KindUtc ,且 sourceTimeZone 不等於 Utc

-或-

dateTime. KindLocal ,且 sourceTimeZone 不等於 Local

-或-

sourceTimeZone .IsInvalidDateTime( dateTime ) 傳回 true

sourceTimeZonenull

範例

下列範例會從本機系統擷取目前的日期,並將它轉換成國際標準時間 (UTC) ,然後將它轉換成東京標準時間,最後從東京標準時間轉換回 UTC。 請注意,這兩個 UTC 時間相同。

using System;

public class Example
{
   public static void Main()
   {
      // Get time in local time zone 
      DateTime thisTime = DateTime.Now;
      Console.WriteLine("Time in {0} zone: {1}", TimeZoneInfo.Local.IsDaylightSavingTime(thisTime) ?
                        TimeZoneInfo.Local.DaylightName : TimeZoneInfo.Local.StandardName, thisTime);
      Console.WriteLine("   UTC Time: {0}", TimeZoneInfo.ConvertTimeToUtc(thisTime, TimeZoneInfo.Local));
      // Get Tokyo Standard Time zone
      TimeZoneInfo tst = TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time");
      DateTime tstTime = TimeZoneInfo.ConvertTime(thisTime, TimeZoneInfo.Local, tst);      
      Console.WriteLine("Time in {0} zone: {1}", tst.IsDaylightSavingTime(tstTime) ?
                        tst.DaylightName : tst.StandardName, tstTime);
      Console.WriteLine("   UTC Time: {0}", TimeZoneInfo.ConvertTimeToUtc(tstTime, tst));
   }
}
// The example displays output like the following when run on a system in the
// U.S. Pacific Standard Time zone:
//       Time in Pacific Standard Time zone: 12/6/2013 10:57:51 AM
//          UTC Time: 12/6/2013 6:57:51 PM
//       Time in Tokyo Standard Time zone: 12/7/2013 3:57:51 AM
//          UTC Time: 12/6/2013 6:57:51 PM
open System

// Get time in local time zone 
let thisTime = DateTime.Now
printfn $"Time in {if TimeZoneInfo.Local.IsDaylightSavingTime thisTime then TimeZoneInfo.Local.DaylightName else TimeZoneInfo.Local.StandardName} zone: {thisTime}"
printfn $"   UTC Time: {TimeZoneInfo.ConvertTimeToUtc(thisTime, TimeZoneInfo.Local)}"
// Get Tokyo Standard Time zone
let tst = TimeZoneInfo.FindSystemTimeZoneById "Tokyo Standard Time"
let tstTime = TimeZoneInfo.ConvertTime(thisTime, TimeZoneInfo.Local, tst)      
printfn $"Time in {if tst.IsDaylightSavingTime tstTime then tst.DaylightName else tst.StandardName} zone: {tstTime}"
printfn $"   UTC Time: {TimeZoneInfo.ConvertTimeToUtc(tstTime, tst)}"
// The example displays output like the following when run on a system in the
// U.S. Pacific Standard Time zone:
//       Time in Pacific Standard Time zone: 12/6/2013 10:57:51 AM
//          UTC Time: 12/6/2013 6:57:51 PM
//       Time in Tokyo Standard Time zone: 12/7/2013 3:57:51 AM
//          UTC Time: 12/6/2013 6:57:51 PM
Module Example
   Public Sub Main()
      ' Get time in local time zone 
      Dim thisTime As Date = Date.Now
      Console.WriteLine("Time in {0} zone: {1}", IIf(TimeZoneInfo.Local.IsDaylightSavingTime(thisTime), 
                        TimeZoneInfo.Local.DaylightName, TimeZoneInfo.Local.StandardName), thisTime)
      Console.WriteLine("   UTC Time: {0}", TimeZoneInfo.ConvertTimeToUtc(thisTime, TimeZoneInfo.Local))
      ' Get Tokyo Standard Time zone
      Dim tst As TimeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time")
      Dim tstTime As Date = TimeZoneInfo.ConvertTime(thisTime, TimeZoneInfo.Local, tst)      
      Console.WriteLine("Time in {0} zone: {1}", IIf(tst.IsDaylightSavingTime(tstTime), 
                        tst.DaylightName, tst.StandardName), tstTime)
      Console.WriteLine("   UTC Time: {0}", TimeZoneInfo.ConvertTimeToUtc(tstTime, tst))
   End Sub
End Module
' The example displays output like the following when run on a system in the U.S.
' Pacific Standard Time zone:
'    Time in Pacific Standard Time zone: 12/6/2013 10:57:51 AM
'       UTC Time: 12/6/2013 6:57:51 PM
'    Time in Tokyo Standard Time zone: 12/7/2013 3:57:51 AM
'       UTC Time: 12/6/2013 6:57:51 PM

備註

Kind如果參數的 dateTime 屬性等於 DateTimeKind.Utc ,且 sourceTimeZone 參數等於 TimeZoneInfo.Utc ,則這個方法會 dateTime 傳回而不執行任何轉換。

如果 dateTime 對應至模棱兩可的時間,此方法會假設它是來源時區的標準時間。 如果 dateTime 對應至不正確時間,這個方法會擲回 ArgumentException

如果國際標準時間 (UTC) 相等 dateTime 專案早于 DateTime.MinValue 或更新版本, DateTime.MaxValue 則這個方法會分別傳 MinValue 回 或 MaxValue

另請參閱

適用於