DateTimeOffset.ToLocalTime 方法

定義

命名空間:

System

組件:

System.Runtime.dll

來源:

DateTimeOffset.cs

將目前 DateTimeOffset 物件轉換為表示本地時間的 DateTimeOffset 物件。

public:
 DateTimeOffset ToLocalTime();

public DateTimeOffset ToLocalTime ();

member this.ToLocalTime : unit -> DateTimeOffset

Public Function ToLocalTime () As DateTimeOffset

傳回

DateTimeOffset

物件，表示轉換為本地時間之目前 DateTimeOffset 物件的日期和時間。

範例

下列範例會 ToLocalTime 使用 方法，將值轉換成 DateTimeOffset 太平洋標準時區中的當地時間。 它也說明方法對當地時區調整規則的支援。

// Local time changes on 3/11/2007 at 2:00 AM
DateTimeOffset originalTime, localTime;

originalTime = new DateTimeOffset(2007, 3, 11, 3, 0, 0,
                                  new TimeSpan(-6, 0, 0));
localTime = originalTime.ToLocalTime();
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(),
                                           localTime.ToString());

originalTime = new DateTimeOffset(2007, 3, 11, 4, 0, 0,
                                  new TimeSpan(-6, 0, 0));
localTime = originalTime.ToLocalTime();
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(),
                                           localTime.ToString());

// Define a summer UTC time
originalTime = new DateTimeOffset(2007, 6, 15, 8, 0, 0,
                                  TimeSpan.Zero);
localTime = originalTime.ToLocalTime();
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(),
                                           localTime.ToString());

// Define a winter time
originalTime = new DateTimeOffset(2007, 11, 30, 14, 0, 0,
                                  new TimeSpan(3, 0, 0));
localTime = originalTime.ToLocalTime();
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(),
                                           localTime.ToString());
// The example produces the following output:
//    Converted 3/11/2007 3:00:00 AM -06:00 to 3/11/2007 1:00:00 AM -08:00.
//    Converted 3/11/2007 4:00:00 AM -06:00 to 3/11/2007 3:00:00 AM -07:00.
//    Converted 6/15/2007 8:00:00 AM +00:00 to 6/15/2007 1:00:00 AM -07:00.
//    Converted 11/30/2007 2:00:00 PM +03:00 to 11/30/2007 3:00:00 AM -08:00.

// Local time changes on 3/11/2007 at 2:00 AM
let originalTime = DateTimeOffset(2007, 3, 11, 3, 0, 0, TimeSpan(-6, 0, 0))
let localTime = originalTime.ToLocalTime()
printfn $"Converted {originalTime} to {localTime}."

let originalTime = DateTimeOffset(2007, 3, 11, 4, 0, 0, TimeSpan(-6, 0, 0))
let localTime = originalTime.ToLocalTime()
printfn $"Converted {originalTime} to {localTime}."

// Define a summer UTC time
let originalTime = DateTimeOffset(2007, 6, 15, 8, 0, 0, TimeSpan.Zero)
let localTime = originalTime.ToLocalTime()
printfn $"Converted {originalTime} to {localTime}."

// Define a winter time
let originalTime = DateTimeOffset(2007, 11, 30, 14, 0, 0, TimeSpan(3, 0, 0))
let localTime = originalTime.ToLocalTime()
printfn $"Converted {originalTime} to {localTime}."

// The example produces the following output:
//    Converted 3/11/2007 3:00:00 AM -06:00 to 3/11/2007 1:00:00 AM -08:00.
//    Converted 3/11/2007 4:00:00 AM -06:00 to 3/11/2007 3:00:00 AM -07:00.
//    Converted 6/15/2007 8:00:00 AM +00:00 to 6/15/2007 1:00:00 AM -07:00.
//    Converted 11/30/2007 2:00:00 PM +03:00 to 11/30/2007 3:00:00 AM -08:00.

' Local time changes on 3/11/2007 at 2:00 AM
Dim originalTime, localTime As DateTimeOffset

originalTime = New DateTimeOffset(#03/11/2007 3:00AM#, _
                                  New TimeSpan(-6, 0, 0))
localTime = originalTime.ToLocalTime()
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(), _
                                           localTime.ToString())       

originalTime = New DateTimeOffset(#03/11/2007 4:00AM#, _
                                  New TimeSpan(-6, 0, 0))
localTime = originalTime.ToLocalTime()
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(), _
                                           localTime.ToString())       

' Define a summer UTC time
originalTime = New DateTimeOffset(#6/15/2007 8:00AM#, _
                                  TimeSpan.Zero)
localTime = originalTime.ToLocalTime()
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(), _
                                           localTime.ToString())       

' Define a winter time
originalTime = New DateTimeOffset(#11/30/2007 2:00PM#, _
                                  New TimeSpan(3, 0, 0))
localTime = originalTime.ToLocalTime()
Console.WriteLine("Converted {0} to {1}.", originalTime.ToString(), _
                                           localTime.ToString())   
' The example produces the following output:
'    Converted 3/11/2007 3:00:00 AM -06:00 to 3/11/2007 1:00:00 AM -08:00.
'    Converted 3/11/2007 4:00:00 AM -06:00 to 3/11/2007 3:00:00 AM -07:00.
'    Converted 6/15/2007 8:00:00 AM +00:00 to 6/15/2007 1:00:00 AM -07:00.
'    Converted 11/30/2007 2:00:00 PM +03:00 to 11/30/2007 3:00:00 AM -08:00.

備註

在執行本機時間轉換時，方法會先將目前 DateTimeOffset 物件的日期和時間轉換為國際標準時間 (UTC) ，方法是從時間減去位移。 然後，它會藉由新增當地時區位移，將 UTC 日期和時間轉換為當地時間。 如此一來，它會考慮當地時區的任何調整規則。

目前 DateTimeOffset 物件的值和方法呼叫所傳回之物件的值 DateTimeOffset 都代表相同的時間點。 也就是說，如果兩者都傳遞至 DateTimeOffset.Equals(DateTimeOffset, DateTimeOffset) 方法，方法會傳回 true 。

如果轉換造成超出型別範圍 DateTimeOffset 的時間，此方法 ToLocalTime 會傳回 DateTimeOffset 物件，該物件會將日期和時間設定為 MaxValue 或 MinValue ，並將位移設定為當地時區位移。

另請參閱

• ToUniversalTime()