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From: jenia.ivlev@gmail.com (jenia.ivlev)
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Subject: Re: writing ledger mode, date picker
Date: Mon, 09 Nov 2015 00:39:16 -0500
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The program is amazing in it's simplicity. 
Thanks very much everyone for your kind help.


(defun insert-new-entry ()
   (interactive)
      (goto-char (point-max))
      (define-key calendar-mode-map "\r" 'get-date)
      (calendar))


(defun get-date ()
(interactive)
    (let* ((x (calendar-cursor-to-date))
           (time (encode-time 0 0 0 (nth 1 x) (nth 0 x) (nth 2 x))))
          (select-window (get-buffer-window "asti" t))
          (insert (format-time-string "%Y-%m-%d" time))))



P.S. This assumes you have an "asti" buffer opened (C-x 4 b asti).