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+;;; hydra-timestamp.el --- Hydra functions to insert timestamps  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018  Oleg Pykhalov
+
+;; Author: Oleg Pykhalov <go.wigust@gmail.com>
+;; Keywords: convenience
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Origin <https://www.wisdomandwonder.com/article/10763/emacsorg-mode-hydra-to-insert-timestamps>.
+;; This package provides ‘hydra’ functions to insert timestamps.
+
+;;; Code:
+
+(defhydra hydra-timestamp (:color blue :hint nil)
+  "
+Timestamps: (_q_uit)
+  Date: _I_SO, _U_S, US With _Y_ear and _D_ashes, US In _W_ords
+   Date/Time: _N_o Colons or _w_ith
+    Org-Mode: _R_ight Now or _c_hoose
+"
+  ("q" nil)
+
+  ("I" hydra-timestamp-insert-datestamp)
+  ("U" hydra-timestamp-insert-datestamp-us)
+  ("Y" hydra-timestamp-insert-datestamp-us-full-year)
+  ("D" hydra-timestamp-insert-datestamp-us-full-year-and-dashes)
+  ("W" hydra-timestamp-insert-datestamp-us-words)
+
+  ("N" hydra-timestamp-insert-timestamp-no-colons)
+  ("w" hydra-timestamp-insert-timestamp)
+
+  ("R" hydra-timestamp-org-time-stamp-with-seconds-now)
+  ("c" org-time-stamp))
+
+(defun hydra-timestamp-insert-datestamp ()
+  "Produces and inserts a partial ISO 8601 format timestamp."
+  (interactive)
+  (insert (format-time-string "%F")))
+
+(defun hydra-timestamp-insert-datestamp-us ()
+  "Produces and inserts a US datestamp."
+  (interactive)
+  (insert (format-time-string "%m/%d/%y")))
+
+(defun hydra-timestamp-insert-datestamp-us-full-year-and-dashes ()
+  "Produces and inserts a US datestamp with full year and dashes."
+  (interactive)
+  (insert (format-time-string "%m-%d-%Y")))
+
+(defun hydra-timestamp-insert-datestamp-us-full-year ()
+  "Produces and inserts a US datestamp with full year."
+  (interactive)
+  (insert (format-time-string "%m/%d/%Y")))
+
+(defun hydra-timestamp-insert-datestamp-us-words ()
+  "Produces and inserts a US datestamp using words."
+  (interactive)
+  (insert (format-time-string "%A %B %d, %Y")))
+
+(defun hydra-timestamp-insert-timestamp-no-colons ()
+  "Inserts a full ISO 8601 format timestamp with colons replaced by hyphens."
+  (interactive)
+  (insert (hydra-timestamp-get-timestamp-no-colons)))
+
+(defun hydra-timestamp-insert-datestamp ()
+  "Produces and inserts a partial ISO 8601 format timestamp."
+  (interactive)
+  (insert (format-time-string "%F")))
+
+(defun hydra-timestamp-get-timestamp-no-colons ()
+  "Produces a full ISO 8601 format timestamp with colons replaced by hyphens."
+  (interactive)
+  (let* ((timestamp (hydra-timestamp-get-timestamp))
+         (timestamp-no-colons (replace-regexp-in-string ":" "-" timestamp)))
+    timestamp-no-colons))
+
+(defun hydra-timestamp-get-timestamp ()
+  "Produces a full ISO 8601 format timestamp."
+  (interactive)
+  (let* ((timestamp-without-timezone (format-time-string "%Y-%m-%dT%T"))
+         (timezone-name-in-numeric-form (format-time-string "%z"))
+         (timezone-utf-offset
+          (concat (substring timezone-name-in-numeric-form 0 3)
+                  ":"
+                  (substring timezone-name-in-numeric-form 3 5)))
+         (timestamp (concat timestamp-without-timezone
+                            timezone-utf-offset)))
+    timestamp))
+
+(defun hydra-timestamp-insert-timestamp ()
+  "Inserts a full ISO 8601 format timestamp."
+  (interactive)
+  (insert (hydra-timestamp-get-timestamp)))
+
+(defun hydra-timestamp-org-time-stamp-with-seconds-now ()
+  (interactive)
+  (let ((current-prefix-arg '(16)))
+    (call-interactively 'org-time-stamp)))
+
+(provide 'hydra-timestamp)
+;;; hydra-timestamp.el ends here