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diff --git a/toot/utils.scm b/toot/utils.scm
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+;;; Toot --- Mastodon client.
+;;; Copyright © 2020 Masaya Tojo <masaya@tojo.tokyo>
+;;;
+;;; This file is part of Toot.
+;;;
+;;; Toot 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.
+;;;
+;;; Toot 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 Toot.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (toot utils)
+  #:use-module (ice-9 format)
+  #:use-module (srfi srfi-19)
+  #:export (and/nil
+
+            created-at->creation-time
+            creation-time->string))
+
+
+;;;
+;;; Macros.
+;;;
+
+(define-syntax-rule (and/nil test expr)
+  (if test
+      expr
+      '()))
+
+
+;;;
+;;; Date
+;;;
+
+(define (created-at->creation-time str)
+  (time-utc->date
+   (date->time-utc
+    (string->date str "~Y-~m-~dT~H:~M:~S.~N~z"))))
+
+(define (creation-time->string date)
+  (date->string date "~4"))