using System;

using RestSharp;

/* ------------------------------------

​

http://jasonwatmore.com/post/2013/07/31/C-Get-time-zone-and-UTC-offset-from-latitude-and-longitude-%28GPS-coordinates%29.aspx

------------------------------------ */

​

public class Program

{

    public static DateTime GetLocalDateTime(double latitude, double longitude, DateTime utcDate)

    {

        var client = new RestClient("https://maps.googleapis.com");

        var request = new RestRequest("maps/api/timezone/json", Method.GET);

        request.AddParameter("location", latitude + "," + longitude);

        request.AddParameter("timestamp", utcDate.ToTimestamp());

        request.AddParameter("sensor", "false");

        var response = client.Execute<GoogleTimeZone>(request);

        return utcDate.AddSeconds(response.Data.rawOffset + response.Data.dstOffset);

    }

    public static void Main()

    {

        var myDateTime = GetLocalDateTime(33.8323, -117.8803, DateTime.UtcNow);

        Console.WriteLine(myDateTime.ToString());

    }

}

​

public class GoogleTimeZone 

{

    public double dstOffset { get; set; }

    public double rawOffset { get; set; }

    public string status { get; set; }

    public string timeZoneId { get; set; }

    public string timeZoneName { get; set; }

}

​

public static class ExtensionMethods 

{

    public static double ToTimestamp(this DateTime date)

    {

        DateTime origin = new DateTime(1970, 1, 1, 0, 0, 0, 0);

        TimeSpan diff = date.ToUniversalTime() - origin;

        return Math.Floor(diff.TotalSeconds);

    }

}