Convert DateTime to time spams in c#

Sometime we need to convert DateTime to time spams like an hour ago, few minutes ago or seconds ago.

public string convertDate(DateTime dt)
        {
            string result = "";
            TimeSpan span = DateTime.Now - dt;
            int days = span.Days;
            int hrs = span.Hours;
            int min = span.Minutes;
            int sec = span.Seconds;
            if (days!=0)
            {
                result = days + " days ago";
            }
            else if (hrs >= 1)
            {
                result = hrs + " hours ago";
            }
            else if (min <= 59 && min>0)
            {

                result = min + " minutes ago";
            }
            else
            {
                result = sec + " seconds ago";
            }

            return result;


        }