convert timespan to readable string format

new_gist_file

public static string ToReadableString(this TimeSpan span)
  {
      string formatted = string.Format("{0}{1}{2}{3}",
          span.Duration().Days > 0 ? string.Format("{0:0} day{1}, ", span.Days, span.Days == 1 ? String.Empty : "s") : string.Empty,
          span.Duration().Hours > 0 ? string.Format("{0:0} hour{1}, ", span.Hours, span.Hours == 1 ? String.Empty : "s") : string.Empty,
          span.Duration().Minutes > 0 ? string.Format("{0:0} minute{1}, ", span.Minutes, span.Minutes == 1 ? String.Empty : "s") : string.Empty,
          span.Duration().Seconds > 0 ? string.Format("{0:0} second{1}", span.Seconds, span.Seconds == 1 ? String.Empty : "s") : string.Empty);

      if (formatted.EndsWith(", ")) formatted = formatted.Substring(0, formatted.Length - 2);

      if (string.IsNullOrEmpty(formatted)) formatted = "0 seconds";

      return formatted;
  }