code: func WmUserTimeWindowGet(xu *xgbutil.XUtil,
  	win xproto.Window) (xproto.Window, error) {
  
  	return xprop.PropValWindow(xprop.GetProperty(xu, win,
  		"_NET_WM_USER_TIME_WINDOW"))
  }
docs: // _NET_WM_USER_TIME_WINDOW get