stuff, like curl and date utils find a number, that looks like a recent number of secs since the epoch and make it human readable

stuff.el

(defun epoch-to-iso ()
  (interactive)
  (re-search-forward "\\([0-9]\\{10,13\\}\\)")  
  (goto-char (match-beginning 0))
  (replace-match (format-time-string "%Y-%m-%d" (seconds-to-time (/  (string-to-int (match-string 1)) 1000))))
)

(defun curl-something (begin end)
  (interactive "r")
  (shell-command (concat "curl " (buffer-substring begin end))))