C# :Seconds TO String

This functions return a string like 1 hours ago, a day ago etc.

//Returns seconds to 1 hour ago, 10 sec ago etc.
        public static string SecondsToString(double seconds)
        {   

                   string time = "";        
                   if (seconds >= 3600)
                    {
                        time =Convert.ToInt32((seconds / 3600)).ToString();
                        if (seconds > 24)
                        {
                            time = Convert.ToInt32((seconds / 24)).ToString();
                            time += " days ago";
                        }
                        else
                            time += " hrs ago";
                    }
                    else if (seconds >= 60)
                    {
                        time = Convert.ToInt32((seconds / 60)).ToString();
                        time += " minutes ago";
                    }
                    else
                    {
                        time = Convert.ToInt32(seconds).ToString();
                        time += " sec ago";
                    }
                   return time;
        }