(defwidget datetime []
  (box
    :class "datetime"
    :halign "center"
    :valign "center"
    { time == ''
      ? ''
      : time
    }
  )
)

(defvar time-visible false)
(defpoll time
  :interval "1s"
  :initial "initial-value"  ; optional, defaults to poll at startup
  :run-while time-visible   ; optional, defaults to 'true'
  `date +"%H:%M - %a, %d %b"`        ; https://www.man7.org/linux/man-pages/man1/date.1.html
)