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diff --git a/gnu/installer/newt/timezone.scm b/gnu/installer/newt/timezone.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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.
+;;;
+;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu installer newt timezone)
+  #:use-module (gnu installer steps)
+  #:use-module (gnu installer timezone)
+  #:use-module (gnu installer newt page)
+  #:use-module (guix i18n)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 receive)
+  #:use-module (newt)
+  #:export (run-timezone-page))
+
+;; Heigth of the listbox displaying timezones.
+(define timezone-listbox-heigth (make-parameter 20))
+
+;; Information textbox width.
+(define info-textbox-width (make-parameter 40))
+
+(define (fill-timezones listbox timezones)
+  "Fill the given LISTBOX with TIMEZONES. Return an association list
+correlating listbox keys with timezones."
+  (map (lambda (timezone)
+         (let ((key (append-entry-to-listbox listbox timezone)))
+           (cons key timezone)))
+       timezones))
+
+(define (run-timezone-page zonetab)
+  "Run a page displaying available timezones, grouped by regions. The user is
+invited to select a timezone. The selected timezone, under Posix format is
+returned."
+  (define (all-but-last list)
+    (reverse (cdr (reverse list))))
+
+  (define (run-page timezone-tree)
+    (define (loop path)
+      (let ((timezones (locate-childrens timezone-tree path)))
+        (run-listbox-selection-page
+         #:title (G_ "Timezone selection")
+         #:info-text (G_ "Please select a timezone.")
+         #:listbox-items timezones
+         #:listbox-item->text identity
+         #:button-text (if (null? path)
+                           (G_ "Cancel")
+                           (G_ "Back"))
+         #:button-callback-procedure
+         (if (null? path)
+             (lambda _
+               (raise
+                (condition
+                 (&installer-step-abort))))
+             (lambda _
+               (loop (all-but-last path))))
+         #:listbox-callback-procedure
+         (lambda (timezone)
+           (let* ((timezone* (append path (list timezone)))
+                  (tz (timezone->posix-tz timezone*)))
+             (if (timezone-has-child? timezone-tree timezone*)
+                 (loop timezone*)
+                 tz))))))
+    (loop '()))
+
+  (let ((timezone-tree (zonetab->timezone-tree zonetab)))
+    (run-page timezone-tree)))