using System;

public class Program

{

    public static void Main()

    {

        var time = new DateTime(2018,07,05,00,00,00);

TimeZoneInfo.ConvertTimeFromUtc(time, TimeZoneInfo.FindSystemTimeZoneById(@"E. Australia Standard Time")).ToLongTimeString().Dump();

TimeZoneInfo.ConvertTimeFromUtc(time.AddDays(-180), TimeZoneInfo.FindSystemTimeZoneById(@"E. Australia Standard Time")).ToLongTimeString().Dump();

TimeZoneInfo.ConvertTimeFromUtc(time, TimeZoneInfo.FindSystemTimeZoneById(@"AUS Eastern Standard Time")).ToLongTimeString().Dump();

TimeZoneInfo.ConvertTimeFromUtc(time.AddDays(-180), TimeZoneInfo.FindSystemTimeZoneById(@"AUS Eastern Standard Time")).ToLongTimeString().Dump();

    }

}