switch seconds {
                case let sec where sec == 0:
                    cell.lastMessage.text = "online"
                case let sec where sec < 60:
                    cell.lastMessage.text = "last seen \(seconds) seconds ago"
                case let sec where sec > 59 && sec < 3600:
                    cell.lastMessage.text = "last seen \(seconds / 60) minutes ago"
                case let sec where sec > 3600 && sec < 86400:
                    cell.lastMessage.text = "last seen \(seconds / 3600) hours ago"
                case let sec where sec > 86400:
                    let seconds: NSNumber = NSNumber(unsignedLong: timeInSeconds)
                    cell.lastMessage.text = NSString(format: "last seen |  %@", NSDate(timeIntervalSinceNow:seconds.doubleValue)) as String
                default:
                    cell.lastMessage.text = "last seen long time ago"
                }