gistfile1.cs

        public static string Relative(this DateTime dt)
        {
            var ts = DateTime.Now.ToUniversalTime() - dt;

            if (ts.TotalMinutes < 1)
                return string.Format("just now");

            if (ts.TotalMinutes < 60)
                return string.Format("{0} minute{1} ago", (int)ts.TotalMinutes, (int)ts.TotalMinutes != 1 ? "s" : "");

            if (ts.TotalHours < 24)
                return string.Format("{0} hour{1} ago", (int)ts.TotalHours, (int)ts.TotalHours != 1 ? "s" : "");

            if (ts.TotalDays < 30)
                return string.Format("{0} day{1} ago", (int)ts.TotalDays, (int)ts.TotalDays != 1 ? "s" : "");

            return string.Format("{0:dd/MM/yyyy}", dt);
        }