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Q: how can I get the last time I built the org agenda buffer?

I've set an idle timer to rebuild my org agenda buffer every x minutes. It works fine, but it's inefficient to rebuild if the agenda files have not been modified since the last rebuild.

I can get the last modification time of, say, the first agenda file with (nth 5 (file-attributes (car org-agenda-files))) and compare it to some hypothetical last-agenda-rebuild variable with time-less-p. However, I don't know where to look for the last rebuild time (or if it's even stored anywhere).

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Idle timer uses current-idle-time to run. So, you can't get last time when it was activate. But you can save the time when it was active.

(defun org-build-agenda ()
  (set last-build-time (current-time-string)
   ;; build agenda)

(setq org-build-timer
      (run-with-idle-timer 5 t 'org-build-agenda))

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