Pchp.Library.DateTimeFunctions.GetSunTime C# (CSharp) Method

        static PhpValue GetSunTime(Context ctx, int timestamp, TimeFormats format, double latitude, double longitude, double zenith, double offset, bool getSunrise)
        {
            var zone = PhpTimeZone.GetCurrentTimeZone(ctx);
            var utc = DateTimeUtils.UnixTimeStampToUtc(timestamp);
            var local = TimeZoneInfo.ConvertTime(utc, zone);

            if (Double.IsNaN(latitude) || Double.IsNaN(longitude) || Double.IsNaN(zenith))
            {
                //LibraryConfiguration config = LibraryConfiguration.GetLocal(ScriptContext.CurrentContext);

                //if (Double.IsNaN(latitude))
                //    latitude = config.Date.Latitude;
                //if (Double.IsNaN(longitude))
                //    longitude = config.Date.Longitude;
                //if (Double.IsNaN(zenith))
                //    zenith = (getSunrise) ? config.Date.SunriseZenith : config.Date.SunsetZenith;
                throw new NotImplementedException();
            }

            if (Double.IsNaN(offset))
                offset = zone.GetUtcOffset(local).TotalHours;

            double result_utc = CalculateSunTime(local.DayOfYear, latitude, longitude, zenith, getSunrise);
            double result = result_utc + offset;

            switch (format)
            {
                case TimeFormats.Integer:
                    return PhpValue.Create((timestamp - (timestamp % (24 * 3600))) + (int)(3600 * result));

                case TimeFormats.String:
                    return PhpValue.Create(string.Format("{0:00}:{1:00}", (int)result, (int)(60 * (result - (double)(int)result))));

                case TimeFormats.Double:
                    return PhpValue.Create(result);

                default:
                    //PhpException.InvalidArgument("format");
                    //return PhpValue.Null;
                    throw new ArgumentException();
            }
        }