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diff --git a/tests/gpgscm/time.scm b/tests/gpgscm/time.scm
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+;; Simple time manipulation library.
+;;
+;; Copyright (C) 2017 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG 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.
+;;
+;; GnuPG 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/>.
+
+;; This library mimics what GnuPG thinks about expiration times.
+;; Granularity is one second.  Its focus is not on correctness.
+
+;; Conversion functions.
+(define (minutes->seconds minutes)
+  (* minutes 60))
+(define (hours->seconds hours)
+  (* hours 60 60))
+(define (days->seconds days)
+  (* days 24 60 60))
+(define (weeks->seconds weeks)
+  (days->seconds (* weeks 7)))
+(define (months->seconds months)
+  (days->seconds (* months 30)))
+(define (years->seconds years)
+  (days->seconds (* years 365)))
+
+(define (time-matches? a b slack)
+  (< (abs (- a b)) slack))
+(assert (time-matches? (hours->seconds 1) (hours->seconds 2) (hours->seconds 2)))
+(assert (time-matches? (hours->seconds 2) (hours->seconds 1) (hours->seconds 2)))
+(assert (not (time-matches? (hours->seconds 4) (hours->seconds 1) (hours->seconds 2))))
+(assert (not (time-matches? (hours->seconds 1) (hours->seconds 4) (hours->seconds 2))))