BridgeStack.UnixTimeSpanConverter.WriteJson C# (CSharp) Метод

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            long result;
            if (value is TimeSpan)
            {
                result = ((TimeSpan)value).ToUnixTime();
            }
            else
            {
                throw new ArgumentException(Error.TimeExpected);
            }
            writer.WriteValue(result);
        }