using System;

public class Program

{

    public static void Main()

    {

          DateTime PSTtimeZoneDatetime= Convert.ToDateTime("8/16/2016 12:56 PM");//your PST timezone datetime

​

    TimeZoneInfo timeZoneInfo;

​

   //Set the time zone information to India Standard Time

    timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("India Standard Time");

​

    //get PST timeZone as Default for datetime

    TimeZoneInfo PSTTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific SA Standard Time");

​

  //IST timezone Datetime

   var ISTdateTime =TimeZoneInfo.ConvertTime(PSTtimeZoneDatetime, PSTTimeZone, timeZoneInfo);

        Console.WriteLine(ISTdateTime);

​

    }

}