TimeZoneInfo.ConvertTimeToUtc Method

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: System.Core.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

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Converts a date and time to Coordinated Universal Time (UTC).

Overloads

ConvertTimeToUtc(DateTime)	Converts the specified date and time to Coordinated Universal Time (UTC).
ConvertTimeToUtc(DateTime, TimeZoneInfo)	Converts the time in a specified time zone to Coordinated Universal Time (UTC).

ConvertTimeToUtc(DateTime)

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Converts the specified date and time to Coordinated Universal Time (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

Parameters

dateTime: DateTime

The date and time to convert.

Returns

DateTime

The Coordinated Universal Time (UTC) that corresponds to the dateTime parameter. The DateTime value's Kind property is always set to Utc.

Exceptions

ArgumentException

TimeZoneInfo.Local.IsInvalidDateTime( dateTime ) returns true.

Examples

The following example illustrates the conversion of time values whose Kind property is DateTimeKind.Utc, DateTimeKind.Local, and DateTimeKind.Unspecified, respectively. It also illustrates the conversion of ambiguous and invalid times.

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

Remarks

The exact conversion performed depends on the value of the Kind property of the dateTime parameter, as the following table shows.

DateTime.Kind property	Conversion
DateTimeKind.Local	Converts from local time to Coordinated Universal Time (UTC).
DateTimeKind.Unspecified	Assumes `dateTime` is local time and converts from local time to UTC.
DateTimeKind.Utc	Returns `dateTime` unchanged.

If dateTime corresponds to an ambiguous local time, this method assumes that it is standard local time. If dateTime corresponds to an invalid local time, the method throws an ArgumentException.

Note

If the current computer's local time zone includes multiple adjustment rules, this overload of the ConvertTimeToUtc method can return results that differ from the TimeZone.ToUniversalTime and DateTime.ToUniversalTime methods. TimeZone.ToUniversalTime always applies the current adjustment rule to time zone conversion, whether or not dateTime lies within its date range. And when executing on .NET Framework 3.5, DateTime.ToUniversalTime also applies the current adjustment rule to time zone conversion, whether or not dateTime lies within its date range.

If the UTC equivalent of dateTime is earlier than DateTime.MinValue or later that DateTime.MaxValue, this method returns MinValue or MaxValue, respectively.

Applies to

ConvertTimeToUtc(DateTime, TimeZoneInfo)

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Converts the time in a specified time zone to Coordinated Universal Time (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

Parameters

dateTime: DateTime

The date and time to convert.

sourceTimeZone: TimeZoneInfo

The time zone of dateTime.

Returns

DateTime

The Coordinated Universal Time (UTC) that corresponds to the dateTime parameter. The DateTime object's Kind property is always set to Utc.

Exceptions

ArgumentException

dateTime.Kind is Utc and sourceTimeZone does not equal Utc.

-or-

dateTime.Kind is Local and sourceTimeZone does not equal Local.

-or-

sourceTimeZone.IsInvalidDateTime(dateTime) returns true.

ArgumentNullException

sourceTimeZone is null.

Examples

The following example retrieves the current date from the local system and converts it to Coordinated Universal Time (UTC), then converts it to Tokyo Standard Time, and finally converts from Tokyo Standard Time back to UTC. Note that the two UTC times are identical.

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

Remarks

If the Kind property of the dateTime parameter equals DateTimeKind.Utc and the sourceTimeZone parameter equals TimeZoneInfo.Utc, this method returns dateTime without performing any conversion.

If dateTime corresponds to an ambiguous time, this method assumes that it is the standard time of the source time zone. If dateTime corresponds to an invalid time, this method throws an ArgumentException.

If the Coordinated Universal Time (UTC) equivalent of dateTime is earlier than DateTime.MinValue or later that DateTime.MaxValue, this method returns MinValue or MaxValue, respectively.

Applies to

Share via

TimeZoneInfo.ConvertTimeToUtc Method

Definition

Overloads

ConvertTimeToUtc(DateTime)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

ConvertTimeToUtc(DateTime, TimeZoneInfo)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

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