// This code example demonstrates the DateTime Kind, Now, and

// UtcNow properties, and the SpecifyKind(), ToLocalTime(),

// and ToUniversalTime() methods.

​

using System;

​

class Sample

{

    public static void Main()

    {

        // Get the date and time for the current moment, adjusted

        // to the local time zone.

​

        DateTime saveNow = DateTime.Now;

​

        // Get the date and time for the current moment expressed

        // as coordinated universal time (UTC).

​

        DateTime saveUtcNow = DateTime.UtcNow;

        DateTime myDt;

​

        // Display the value and Kind property of the current moment

        // expressed as UTC and local time.

​

        DisplayNow("UtcNow: ..........", saveUtcNow);

        DisplayNow("Now: .............", saveNow);

        Console.WriteLine();

​

        // Change the Kind property of the current moment to

        // DateTimeKind.Utc and display the result.

​

        myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Utc);

        Display("Utc: .............", myDt);

​

        // Change the Kind property of the current moment to

        // DateTimeKind.Local and display the result.

​

        myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Local);

        Display("Local: ...........", myDt);

​

        // Change the Kind property of the current moment to

        // DateTimeKind.Unspecified and display the result.

​

        myDt = DateTime.SpecifyKind(saveNow, DateTimeKind.Unspecified);

        Display("Unspecified: .....", myDt);

    }

​

    // Display the value and Kind property of a DateTime structure, the

    // DateTime structure converted to local time, and the DateTime

    // structure converted to universal time.

​

    public static string datePatt = @"d/M/yyyy hh:mm:ss tt";

    public static void Display(string title, DateTime inputDt)

    {

        DateTime dispDt = inputDt;

        string dtString;

​

        // Display the original DateTime.

​

        dtString = dispDt.ToString(datePatt);

        Console.WriteLine("{0} {1}, Kind = {2}",

                          title, dtString, dispDt.Kind);

​

        // Convert inputDt to local time and display the result.

        // If inputDt.Kind is DateTimeKind.Utc, the conversion is performed.

        // If inputDt.Kind is DateTimeKind.Local, the conversion is not performed.

        // If inputDt.Kind is DateTimeKind.Unspecified, the conversion is

        // performed as if inputDt was universal time.

​

        dispDt = inputDt.ToLocalTime();

        dtString = dispDt.ToString(datePatt);

        Console.WriteLine("  ToLocalTime:     {0}, Kind = {1}",

                          dtString, dispDt.Kind);

​

        // Convert inputDt to universal time and display the result.

        // If inputDt.Kind is DateTimeKind.Utc, the conversion is not performed.

        // If inputDt.Kind is DateTimeKind.Local, the conversion is performed.

        // If inputDt.Kind is DateTimeKind.Unspecified, the conversion is

        // performed as if inputDt was local time.

​

        dispDt = inputDt.ToUniversalTime();

        dtString = dispDt.ToString(datePatt);

        Console.WriteLine("  ToUniversalTime: {0}, Kind = {1}",

                          dtString, dispDt.Kind);

        Console.WriteLine();

        // TimeZoneInfo aest = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");

        // Console.WriteLine("TimeZoneInfo: {0}", aest);

        TimeZoneInfo localZone = TimeZoneInfo.Local;

      Console.WriteLine("Local Time Zone ID: {0}", localZone.Id);

      Console.WriteLine("   Display Name is: {0}.", localZone.DisplayName);

      Console.WriteLine("   Standard name is: {0}.", localZone.StandardName);

      Console.WriteLine("   Daylight saving name is: {0}.", localZone.DaylightName); 

        var timezones = TimeZoneInfo.GetSystemTimeZones();

        TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById("AUS Eastern Standard Time");

DateTime localDateTime = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, tzi);

         dtString = localDateTime.ToString(datePatt);

         Console.WriteLine("TIME ZONE INFO: {0}", tzi);

        Console.WriteLine("LOCAL HOPEFULLY: {0}", dtString);

    }

​

    // Display the value and Kind property for DateTime.Now and DateTime.UtcNow.

​

    public static void DisplayNow(string title, DateTime inputDt)

    {

        string dtString = inputDt.ToString(datePatt);

        Console.WriteLine("{0} {1}, Kind = {2}",

                          title, dtString, inputDt.Kind);

    }

}

​

/*

This code example produces the following results:

​

UtcNow: .......... 5/6/2005 09:34:42 PM, Kind = Utc

Now: ............. 5/6/2005 02:34:42 PM, Kind = Local

​

Utc: ............. 5/6/2005 02:34:42 PM, Kind = Utc

  ToLocalTime:     5/6/2005 07:34:42 AM, Kind = Local

  ToUniversalTime: 5/6/2005 02:34:42 PM, Kind = Utc

​

Local: ........... 5/6/2005 02:34:42 PM, Kind = Local

  ToLocalTime:     5/6/2005 02:34:42 PM, Kind = Local

  ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc

​

Unspecified: ..... 5/6/2005 02:34:42 PM, Kind = Unspecified

  ToLocalTime:     5/6/2005 07:34:42 AM, Kind = Local

  ToUniversalTime: 5/6/2005 09:34:42 PM, Kind = Utc

​

*/