Επεξεργασία

Κοινή χρήση μέσω

TimeZoneInfo.ConvertTime Method

  • Reference

Definition

Namespace:
System
Assembly:
System.Runtime.dll
Assembly:
System.Core.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Converts a time to the time in a particular time zone.

Overloads

ConvertTime(DateTime, TimeZoneInfo)

Converts a time to the time in a particular time zone.
ConvertTime(DateTimeOffset, TimeZoneInfo)

Converts a time to the time in a particular time zone.
ConvertTime(DateTime, TimeZoneInfo, TimeZoneInfo)

Converts a time from one time zone to another.

ConvertTime(DateTime, TimeZoneInfo)

Source:
TimeZoneInfo.cs
Source:
TimeZoneInfo.cs
Source:
TimeZoneInfo.cs

Converts a time to the time in a particular time zone.

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

Parameters

dateTime
DateTime

The date and time to convert.

destinationTimeZone
TimeZoneInfo

The time zone to convert dateTime to.

Returns

DateTime

The date and time in the destination time zone.

Exceptions

ArgumentException

The value of the dateTime parameter represents an invalid time.

ArgumentNullException

The value of the destinationTimeZone parameter is null.

Examples

The following example converts an array of date and time values to times in the Eastern Time zone of the U.S. and Canada. It shows that the source time zone depends on the DateTime.Kind property of the source DateTime value. It also illustrates that the ConvertTime method takes time zone adjustments into account, because a time zone adjustment occurs in both the source and destination time zones at 2:00 A.M. on November 7, 2010.

using System;

public class Example
{
   public static void Main()
   {
      // Define times to be converted.
      DateTime[] times = { new DateTime(2010, 1, 1, 0, 1, 0), 
                           new DateTime(2010, 1, 1, 0, 1, 0, DateTimeKind.Utc), 
                           new DateTime(2010, 1, 1, 0, 1, 0, DateTimeKind.Local),                            
                           new DateTime(2010, 11, 6, 23, 30, 0),
                           new DateTime(2010, 11, 7, 2, 30, 0) };
                              
      // Retrieve the time zone for Eastern Standard Time (U.S. and Canada).
      TimeZoneInfo est; 
      try {
         est = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
      }
      catch (TimeZoneNotFoundException) {
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.");
         return;
      }
      catch (InvalidTimeZoneException) {
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.");
         return;
      }   

      // Display the current time zone name.
      Console.WriteLine("Local time zone: {0}\n", TimeZoneInfo.Local.DisplayName);
      
      // Convert each time in the array.
      foreach (DateTime timeToConvert in times)
      {
         DateTime targetTime = TimeZoneInfo.ConvertTime(timeToConvert, est);
         Console.WriteLine("Converted {0} {1} to {2}.", timeToConvert, 
                           timeToConvert.Kind, targetTime);
      }                        
   }
}
// The example displays the following output:
//    Local time zone: (GMT-08:00) Pacific Time (US & Canada)
//    
//    Converted 1/1/2010 12:01:00 AM Unspecified to 1/1/2010 3:01:00 AM.
//    Converted 1/1/2010 12:01:00 AM Utc to 12/31/2009 7:01:00 PM.
//    Converted 1/1/2010 12:01:00 AM Local to 1/1/2010 3:01:00 AM.
//    Converted 11/6/2010 11:30:00 PM Unspecified to 11/7/2010 1:30:00 AM.
//    Converted 11/7/2010 2:30:00 AM Unspecified to 11/7/2010 5:30:00 AM.

open System

// Define times to be converted.
let times = 
    [| DateTime(2010, 1, 1, 0, 1, 0)
       DateTime(2010, 1, 1, 0, 1, 0, DateTimeKind.Utc)
       DateTime(2010, 1, 1, 0, 1, 0, DateTimeKind.Local)
       DateTime(2010, 11, 6, 23, 30, 0)
       DateTime(2010, 11, 7, 2, 30, 0) |]
                        
// Retrieve the time zone for Eastern Standard Time (U.S. and Canada).
try
    let est = TimeZoneInfo.FindSystemTimeZoneById "Eastern Standard Time"

    // Display the current time zone name.
    printfn $"Local time zone: {TimeZoneInfo.Local.DisplayName}\n"

    // Convert each time in the array.
    for timeToConvert in times do
        let targetTime = TimeZoneInfo.ConvertTime(timeToConvert, est)
        printfn $"Converted {timeToConvert} {timeToConvert.Kind} to {targetTime}."
with
| :? TimeZoneNotFoundException ->
    printfn "Unable to retrieve the Eastern Standard time zone."
| :? InvalidTimeZoneException ->
    printfn "Unable to retrieve the Eastern Standard time zone."
// The example displays the following output:
//    Local time zone: (GMT-08:00) Pacific Time (US & Canada)
//    
//    Converted 1/1/2010 12:01:00 AM Unspecified to 1/1/2010 3:01:00 AM.
//    Converted 1/1/2010 12:01:00 AM Utc to 12/31/2009 7:01:00 PM.
//    Converted 1/1/2010 12:01:00 AM Local to 1/1/2010 3:01:00 AM.
//    Converted 11/6/2010 11:30:00 PM Unspecified to 11/7/2010 1:30:00 AM.
//    Converted 11/7/2010 2:30:00 AM Unspecified to 11/7/2010 5:30:00 AM.

Module Example
   Public Sub Main()
      ' Define times to be converted.
      Dim times() As Date = { #1/1/2010 12:01AM#, _
                              DateTime.SpecifyKind(#1/1/2010 12:01AM#, DateTimeKind.Utc), _
                              DateTime.SpecifyKind(#1/1/2010 12:01AM#, DateTimeKind.Local), _
                              #11/6/2010 11:30PM#, #11/7/2010 2:30AM# }
                              
      ' Retrieve the time zone for Eastern Standard Time (U.S. and Canada).
      Dim est As TimeZoneInfo 
      Try
         est = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time")
      Catch e As TimeZoneNotFoundException
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.")
         Exit Sub
      Catch e As InvalidTimeZoneException
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.")
         Exit Sub
      End Try   

      ' Display the current time zone name.
      Console.WriteLine("Local time zone: {0}", TimeZoneInfo.Local.DisplayName)
      Console.WriteLine()
      
      ' Convert each time in the array.
      For Each timeToConvert As Date In times
         Dim targetTime As Date = TimeZoneInfo.ConvertTime(timeToConvert, est)
         Console.WriteLine("Converted {0} {1} to {2}.", timeToConvert, _
                           timeToConvert.Kind, targetTime)
      Next                        
   End Sub
End Module
' The example displays the following output:
'    Local time zone: (GMT-08:00) Pacific Time (US & Canada)
'    
'    Converted 1/1/2010 12:01:00 AM Unspecified to 1/1/2010 3:01:00 AM.
'    Converted 1/1/2010 12:01:00 AM Utc to 12/31/2009 7:01:00 PM.
'    Converted 1/1/2010 12:01:00 AM Local to 1/1/2010 3:01:00 AM.
'    Converted 11/6/2010 11:30:00 PM Unspecified to 11/7/2010 1:30:00 AM.
'    Converted 11/7/2010 2:30:00 AM Unspecified to 11/7/2010 5:30:00 AM.

Remarks

When performing the conversion, the ConvertTime(DateTimeOffset, TimeZoneInfo) method applies any adjustment rules in effect in the destinationTimeZone time zone.

This overload of the ConvertTime(DateTime, TimeZoneInfo) method determines the source time zone from the value of the dateTime parameter's Kind property, as the following table shows.

Kind property value Source time zone Method behavior
DateTimeKind.Local Local Converts the local time to the time in destinationTimeZone.
DateTimeKind.Utc Utc Converts Coordinated Universal Time (UTC) to the time in destinationTimeZone.
DateTimeKind.Unspecified Assumed to be Local. Converts the local time to the time in destinationTimeZone.

The Kind property of the returned DateTime value is set as shown in the following table.

Condition Returned Kind property value
The destinationTimeZone is TimeZoneInfo.Utc. DateTimeKind.Utc
The destinationTimeZone is TimeZoneInfo.Local. DateTimeKind.Local
All other date and time values and destination time zones. DateTimeKind.Unspecified

If the value of the dateTime parameter is an ambiguous local time, it is interpreted as a standard time. If the dateTime parameter is an invalid local time, this method throws an ArgumentException.

If the conversion of dateTime results in a date and time value that is earlier than DateTime.MinValue or later than DateTime.MaxValue, this method returns DateTime.MinValue or DateTime.MaxValue, respectively.

You can also convert to or from UTC by calling the ConvertTimeFromUtc and ConvertTimeToUtc methods.

See also

Applies to

ConvertTime(DateTimeOffset, TimeZoneInfo)

Source:
TimeZoneInfo.cs
Source:
TimeZoneInfo.cs
Source:
TimeZoneInfo.cs

Converts a time to the time in a particular time zone.

public:
 static DateTimeOffset ConvertTime(DateTimeOffset dateTimeOffset, TimeZoneInfo ^ destinationTimeZone);
public static DateTimeOffset ConvertTime (DateTimeOffset dateTimeOffset, TimeZoneInfo destinationTimeZone);
static member ConvertTime : DateTimeOffset * TimeZoneInfo -> DateTimeOffset
Public Shared Function ConvertTime (dateTimeOffset As DateTimeOffset, destinationTimeZone As TimeZoneInfo) As DateTimeOffset

Parameters

dateTimeOffset
DateTimeOffset

The date and time to convert.

destinationTimeZone
TimeZoneInfo

The time zone to convert dateTimeOffset to.

Returns

DateTimeOffset

The date and time in the destination time zone.

Exceptions

ArgumentNullException

The value of the destinationTimeZone parameter is null.

Examples

The following example converts an array of DateTimeOffset values to times in the Eastern Time zone of the U.S. and Canada. It illustrates that the ConvertTime method takes time zone adjustments into account, because a time zone adjustment occurs in both the source and destination time zones at 2:00 A.M. on November 7, 2010.

using System;

public class Example
{
   public static void Main()
   {
      // Define times to be converted.
      DateTime time1 = new DateTime(2010, 1, 1, 12, 1, 0);
      DateTime time2 = new DateTime(2010, 11, 6, 23, 30, 0);
      DateTimeOffset[] times = { new DateTimeOffset(time1, TimeZoneInfo.Local.GetUtcOffset(time1)),
                                 new DateTimeOffset(time1, TimeSpan.Zero),
                                 new DateTimeOffset(time2, TimeZoneInfo.Local.GetUtcOffset(time2)),
                                 new DateTimeOffset(time2.AddHours(3), TimeZoneInfo.Local.GetUtcOffset(time2.AddHours(3))) };
                              
      // Retrieve the time zone for Eastern Standard Time (U.S. and Canada).
      TimeZoneInfo est; 
      try {
         est = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
      }
      catch (TimeZoneNotFoundException) {
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.");
         return;
      }
      catch (InvalidTimeZoneException) {
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.");
         return;
      }   

      // Display the current time zone name.
      Console.WriteLine("Local time zone: {0}\n", TimeZoneInfo.Local.DisplayName);
      
      // Convert each time in the array.
      foreach (DateTimeOffset timeToConvert in times)
      {
         DateTimeOffset targetTime = TimeZoneInfo.ConvertTime(timeToConvert, est);
         Console.WriteLine("Converted {0} to {1}.", timeToConvert, targetTime);
      }                        
   }
}
// The example displays the following output:
//    Local time zone: (GMT-08:00) Pacific Time (US & Canada)
//    
//    Converted 1/1/2010 12:01:00 AM -08:00 to 1/1/2010 3:01:00 AM -05:00.
//    Converted 1/1/2010 12:01:00 AM +00:00 to 12/31/2009 7:01:00 PM -05:00.
//    Converted 11/6/2010 11:30:00 PM -07:00 to 11/7/2010 1:30:00 AM -05:00.
//    Converted 11/7/2010 2:30:00 AM -08:00 to 11/7/2010 5:30:00 AM -05:00.

open System

// Define times to be converted.
let time1 = DateTime(2010, 1, 1, 12, 1, 0)
let time2 = DateTime(2010, 11, 6, 23, 30, 0)
let times = 
    [| DateTimeOffset(time1, TimeZoneInfo.Local.GetUtcOffset time1)
       DateTimeOffset(time1, TimeSpan.Zero)
       DateTimeOffset(time2, TimeZoneInfo.Local.GetUtcOffset time2)
       DateTimeOffset(time2.AddHours 3, TimeZoneInfo.Local.GetUtcOffset(time2.AddHours 3)) |]
                        
// Retrieve the time zone for Eastern Standard Time (U.S. and Canada).
try
    let est = TimeZoneInfo.FindSystemTimeZoneById "Eastern Standard Time"

    // Display the current time zone name.
    printfn $"Local time zone: {TimeZoneInfo.Local.DisplayName}\n"

    // Convert each time in the array.
    for timeToConvert in times do
        let targetTime = TimeZoneInfo.ConvertTime(timeToConvert, est)
        printfn $"Converted {timeToConvert} to {targetTime}."
with
| :? TimeZoneNotFoundException ->
    printfn "Unable to retrieve the Eastern Standard time zone."
| :? InvalidTimeZoneException ->
    printfn "Unable to retrieve the Eastern Standard time zone."
// The example displays the following output:
//    Local time zone: (GMT-08:00) Pacific Time (US & Canada)
//    
//    Converted 1/1/2010 12:01:00 AM -08:00 to 1/1/2010 3:01:00 AM -05:00.
//    Converted 1/1/2010 12:01:00 AM +00:00 to 12/31/2009 7:01:00 PM -05:00.
//    Converted 11/6/2010 11:30:00 PM -07:00 to 11/7/2010 1:30:00 AM -05:00.
//    Converted 11/7/2010 2:30:00 AM -08:00 to 11/7/2010 5:30:00 AM -05:00.

Module Example
   Public Sub Main()
      ' Define times to be converted.
      Dim time1 As Date = #1/1/2010 12:01AM#
      Dim time2 As Date = #11/6/2010 11:30PM#
      Dim times() As DateTimeOffset = { New DateTimeOffset(time1, TimeZoneInfo.Local.GetUtcOffset(time1)), _
                                        New DateTimeOffset(time1, Timespan.Zero), _
                                        New DateTimeOffset(time2, TimeZoneInfo.Local.GetUtcOffset(time2)), _
                                        New DateTimeOffset(time2.AddHours(3), TimeZoneInfo.Local.GetUtcOffset(time2.AddHours(3))) }
                              
      ' Retrieve the time zone for Eastern Standard Time (U.S. and Canada).
      Dim est As TimeZoneInfo 
      Try
         est = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time")
      Catch e As TimeZoneNotFoundException
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.")
         Exit Sub
      Catch e As InvalidTimeZoneException
         Console.WriteLine("Unable to retrieve the Eastern Standard time zone.")
         Exit Sub
      End Try   

      ' Display the current time zone name.
      Console.WriteLine("Local time zone: {0}", TimeZoneInfo.Local.DisplayName)
      Console.WriteLine()
      
      ' Convert each time in the array.
      For Each timeToConvert As DateTimeOffset In times
         Dim targetTime As DateTimeOffset = TimeZoneInfo.ConvertTime(timeToConvert, est)
         Console.WriteLine("Converted {0} to {1}.", timeToConvert, targetTime)
      Next                        
   End Sub
End Module
' The example displays the following output:
'    Local time zone: (GMT-08:00) Pacific Time (US & Canada)
'    
'    Converted 1/1/2010 12:01:00 AM -08:00 to 1/1/2010 3:01:00 AM -05:00.
'    Converted 1/1/2010 12:01:00 AM +00:00 to 12/31/2009 7:01:00 PM -05:00.
'    Converted 11/6/2010 11:30:00 PM -07:00 to 11/7/2010 1:30:00 AM -05:00.
'    Converted 11/7/2010 2:30:00 AM -08:00 to 11/7/2010 5:30:00 AM -05:00.

Remarks

When performing the conversion, the ConvertTime(DateTimeOffset, TimeZoneInfo) method applies any adjustment rules in effect in the destinationTimeZone time zone.

This overload differs from the other overloads of the ConvertTime method by accepting a DateTimeOffset value as its first parameter. This identifies the date and time as an offset from Coordinated Universal Time (UTC) rather than as the date and time in a particular time zone. As a result, the dateTimeOffset parameter cannot represent either an ambiguous time or an invalid time.

In converting the dateTimeOffset value to the time in the destination time zone, this method takes into account any adjustment rules in effect in the destination time zone.

If the conversion of dateTimeOffset results in a date and time value that is earlier than DateTimeOffset.MinValue or later than DateTimeOffset.MaxValue, this method returns DateTimeOffset.MinValue or DateTimeOffset.MaxValue, respectively.

See also

Applies to

ConvertTime(DateTime, TimeZoneInfo, TimeZoneInfo)

Source:
TimeZoneInfo.cs
Source:
TimeZoneInfo.cs
Source:
TimeZoneInfo.cs

Converts a time from one time zone to another.

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

Parameters

dateTime
DateTime

The date and time to convert.

sourceTimeZone
TimeZoneInfo

The time zone of dateTime.

destinationTimeZone
TimeZoneInfo

The time zone to convert dateTime to.

Returns

DateTime

The date and time in the destination time zone that corresponds to the dateTime parameter in the source time zone.

Exceptions

ArgumentException

The Kind property of the dateTime parameter is Local, but the sourceTimeZone parameter does not equal Local.

-or-

The Kind property of the dateTime parameter is Utc, but the sourceTimeZone parameter does not equal Utc.

-or-

The dateTime parameter is an invalid time (that is, it represents a time that does not exist because of a time zone's adjustment rules).

ArgumentNullException

The sourceTimeZone parameter is null.

-or-

The destinationTimeZone parameter is null.

Examples

The following example illustrates the use of the ConvertTime(DateTime, TimeZoneInfo, TimeZoneInfo) method to convert from Hawaiian Standard Time to local time.

DateTime hwTime = new DateTime(2007, 02, 01, 08, 00, 00);
try
{
   TimeZoneInfo hwZone = TimeZoneInfo.FindSystemTimeZoneById("Hawaiian Standard Time");
   Console.WriteLine("{0} {1} is {2} local time.", 
           hwTime, 
           hwZone.IsDaylightSavingTime(hwTime) ? hwZone.DaylightName : hwZone.StandardName, 
           TimeZoneInfo.ConvertTime(hwTime, hwZone, TimeZoneInfo.Local));
}
catch (TimeZoneNotFoundException)
{
   Console.WriteLine("The registry does not define the Hawaiian Standard Time zone.");
}                           
catch (InvalidTimeZoneException)
{
   Console.WriteLine("Registry data on the Hawaiian Standard Time zone has been corrupted.");
}

let hwTime = DateTime(2007, 02, 01, 08, 00, 00)
try
    let hwZone = TimeZoneInfo.FindSystemTimeZoneById "Hawaiian Standard Time"
    printfn $"{hwTime} {if hwZone.IsDaylightSavingTime hwTime then hwZone.DaylightName else hwZone.StandardName} is {TimeZoneInfo.ConvertTime(hwTime, hwZone, TimeZoneInfo.Local)} local time." 
with
| :? TimeZoneNotFoundException ->
    printfn "The registry does not define the Hawaiian Standard Time zone."
| :? InvalidTimeZoneException ->
    printfn "Registry data on the Hawaiian Standard Time zone has been corrupted."

Dim hwTime As Date = #2/01/2007 8:00:00 AM#
Try
   Dim hwZone As TimeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Hawaiian Standard Time")
   Console.WriteLine("{0} {1} is {2} local time.", _
                     hwTime, _
                     IIf(hwZone.IsDaylightSavingTime(hwTime), hwZone.DaylightName, hwZone.StandardName), _
                     TimeZoneInfo.ConvertTime(hwTime, hwZone, TimeZoneInfo.Local))
Catch e As TimeZoneNotFoundException
   Console.WriteLine("The registry does not define the Hawaiian Standard Time zone.")
Catch e As InvalidTimeZoneException
   Console.WriteLine("Registry data on the Hawaiian Standard Time zone has been corrupted.")
End Try

Remarks

When performing the conversion, the ConvertTime method applies any adjustment rules in effect in the destinationTimeZone time zone.

The value of the Kind property of the dateTime parameter must correspond to the sourceTimeZone parameter, as the following table shows.

DateTime.Kind value sourceTimeZone value Method behavior
DateTimeKind.Utc Equals TimeZoneInfo.Utc. Converts dateTime to the destination time zone's time.
DateTimeKind.Utc Does not equal TimeZoneInfo.Utc. Throws an ArgumentException.
DateTimeKind.Local Equals TimeZoneInfo.Local. Converts dateTime to the destination time zone's time.
DateTimeKind.Local Does not equal TimeZoneInfo.Local. Throws an ArgumentException.
DateTimeKind.Unspecified Any. Converts dateTime to the destination time zone's time.

You can also convert to or from Coordinated Universal Time (UTC) by calling the ConvertTimeFromUtc and ConvertTimeToUtc methods.

The Kind property of the returned DateTime value is set as shown in the following table.

Condition Returned Kind property value
The destinationTimeZone argument is TimeZoneInfo.Utc. DateTimeKind.Utc
The destinationTimeZone argument is TimeZoneInfo.Local. DateTimeKind.Local
All other date and time values, source time zones, and destination time zones. DateTimeKind.Unspecified

If the value of the dateTime parameter is an ambiguous time in the source time zone, it is interpreted as a standard time. If the dateTime parameter is an invalid time in the source time zone, this method throws an ArgumentException.

If the conversion of dateTime results in a date and time value that is earlier than DateTime.MinValue or later than DateTime.MaxValue, this method returns DateTime.MinValue or DateTime.MaxValue, respectively.

The ConvertTime(DateTime, TimeZoneInfo, TimeZoneInfo) method throws an ArgumentException exception if the DateTime.Kind property of the dateTime argument is DateTimeKind.Local but the sourceTimeZone argument is not TimeZoneInfo.Local. To determine whether the source time zone is the local time zone or the universal time zone, the method tests for reference equality instead of testing for value equality with the Equals(TimeZoneInfo) method. Note that TimeZoneInfo objects that represent the local time zone and that are retrieved by calling the FindSystemTimeZoneById method do not have referential equality with TimeZoneInfo.Local. Furthermore, TimeZoneInfo objects that represent the local or universal time zone and that are retrieved by iterating the collection returned by the GetSystemTimeZones method do not have referential equality with TimeZoneInfo.Local or TimeZoneInfo.Utc. As an alternative, you can call the ConvertTimeBySystemTimeZoneId(DateTime, String, String) method.

See also

Applies to