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TimeZone::ToLocalTime Method

Returns the local time that corresponds to a specified date and time value.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public:
virtual DateTime ToLocalTime(
	DateTime time
)

Parameters

time
Type: System::DateTime
A Coordinated Universal Time (UTC) time.

Return Value

Type: System::DateTime
A DateTime object whose value is the local time that corresponds to time.

The following table shows the relationship between the time parameter and the DateTime value returned by this method.

time parameter

Behavior

Return value

A Coordinated Universal Time (UTC) time (DateTimeKind::Utc).

Converts the time from UTC to the local time.

A DateTime object whose value is the local time that corresponds to time.

A local time (DateTimeKind::Local).

No conversion necessary.

The same DateTime value represented by the time parameter.

An unspecified time (DateTimeKind::Unspecified).

Assumes that the time is UTC and converts it from UTC to the local time.

A DateTime object whose value is the local time that corresponds to time.

If the local time zone observes daylight saving time, ToLocalTime applies the current adjustment rule to time when performing the conversion.

NoteNote

   The ToLocalTime method recognizes only the current daylight saving time adjustment rule for the local time zone. As a result, it is guaranteed to accurately return the local time corresponding to a particular UTC time only during the period in which the latest adjustment rule is in effect. It may return inaccurate results if time is a historic date and time value that was subject to a previous adjustment rule.

The ToLocalTime method corresponds to the TimeZoneInfo::ConvertTimeFromUtc method with its destinationTimeZone parameter set to TimeZoneInfo::Local. Whenever possible, use the TimeZoneInfo::ConvertTimeFromUtc method.

Notes to Inheritors

Although it is not required, in most cases derived classes running under the .NET Framework version 2.0 should override the default implementation of this method. In the .NET Framework versions 1.0 and 1.1, the ToLocalTime method called the GetUtcOffset method and adjusted for daylight saving time when returning the local time. However, starting with the .NET Framework 2.0, the behavior of the default implementation depends on the Kind property of the time parameter. If its value is DateTimeKind::Local, this method returns time unchanged. If its value is either DateTimeKind::Utc or DateTimeKind::Unspecified, this method assumes time is UTC and converts it to the local system time without calling the GetUtcOffset method.

The following code provides a simple override of the default implementation of the ToLocalTime method. In this code, the internalTimeZone variable represents a private instance of the TimeZone class:

No code example is currently available or this language may not be supported.

The following example uses the ToLocalTime method to return the local times that correspond to several Coordinated Universal Time (UTC) times.


// Example of the TimeZone::ToLocalTime( DateTime ) and 
// TimeZone::GetUtcOffset( DateTime ) methods.
using namespace System;
int main()
{
   String^ headFmt = "{0,-20}{1,-20}{2,-12}{3}";

   // Get the local time zone and a base Coordinated Universal 
   // Time (UTC).
   TimeZone^ localZone = TimeZone::CurrentTimeZone;
   DateTime baseUTC = DateTime(2000,1,1);
   Console::WriteLine( "This example of \n"
   "   TimeZone::ToLocalTime( DateTime ) and\n"
   "   TimeZone::GetUtcOffset( DateTime ) \ngenerates the "
   "following output, which varies depending on the time "
   "zone \nin which it is run. The example creates several "
   "Coordinated Universal \nTimes (UTC), displays the "
   "corresponding local times and UTC offsets, \nand shows "
   "if the times occur in daylight saving time (DST)." );
   Console::WriteLine( "\nLocal time: {0}\n", localZone->StandardName );
   Console::WriteLine( headFmt, "UTC", "Local Time", " Offset", "DST?" );
   Console::WriteLine( headFmt, "---", "----------", " ------", "----" );

   // Generate several UTC times.
   for ( int loopX = 0; loopX <= 10; loopX++ )
   {

      // Calculate the local time and UTC offset.
      DateTime localTime = localZone->ToLocalTime( baseUTC );
      TimeSpan localOffset = localZone->GetUtcOffset( localTime );
      Console::WriteLine( "{0,-20:yyyy-MM-dd HH:mm}"
      "{1,-20:yyyy-MM-dd HH:mm}{2,-12}{3}", baseUTC, localTime, localOffset, localZone->IsDaylightSavingTime( localTime ) );

      // Advance to another UTC.
      baseUTC = baseUTC.AddDays( 155.55 );

   }
}

/*
This example of
   TimeZone::ToLocalTime( DateTime ) and
   TimeZone::GetUtcOffset( DateTime )
generates the following output, which varies depending on the time zone
in which it is run. The example creates several Coordinated Universal
Times (UTC), displays the corresponding local times and UTC offsets,
and shows if the times occur in daylight saving time (DST).

Local time: Pacific Standard Time

UTC                 Local Time           Offset     DST?
---                 ----------           ------     ----
2000-01-01 00:00    1999-12-31 16:00    -08:00:00   False
2000-06-04 13:12    2000-06-04 06:12    -07:00:00   True
2000-11-07 02:24    2000-11-06 18:24    -08:00:00   False
2001-04-11 15:36    2001-04-11 08:36    -07:00:00   True
2001-09-14 04:48    2001-09-13 21:48    -07:00:00   True
2002-02-16 18:00    2002-02-16 10:00    -08:00:00   False
2002-07-22 07:12    2002-07-22 00:12    -07:00:00   True
2002-12-24 20:24    2002-12-24 12:24    -08:00:00   False
2003-05-29 09:36    2003-05-29 02:36    -07:00:00   True
2003-10-31 22:48    2003-10-31 14:48    -08:00:00   False
2004-04-04 12:00    2004-04-04 05:00    -07:00:00   True
*/


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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