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43 lines
1.6 KiB
Scheme
43 lines
1.6 KiB
Scheme
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;; Simple time manipulation library.
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;;
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;; Copyright (C) 2017 g10 Code GmbH
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;;
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;; This file is part of GnuPG.
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;;
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;; GnuPG is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; GnuPG is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, see <http://www.gnu.org/licenses/>.
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;; This library mimics what GnuPG thinks about expiration times.
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;; Granularity is one second. Its focus is not on correctness.
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;; Conversion functions.
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(define (minutes->seconds minutes)
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(* minutes 60))
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(define (hours->seconds hours)
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(* hours 60 60))
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(define (days->seconds days)
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(* days 24 60 60))
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(define (weeks->seconds weeks)
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(days->seconds (* weeks 7)))
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(define (months->seconds months)
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(days->seconds (* months 30)))
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(define (years->seconds years)
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(days->seconds (* years 365)))
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(define (time-matches? a b slack)
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(< (abs (- a b)) slack))
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(assert (time-matches? (hours->seconds 1) (hours->seconds 2) (hours->seconds 2)))
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(assert (time-matches? (hours->seconds 2) (hours->seconds 1) (hours->seconds 2)))
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(assert (not (time-matches? (hours->seconds 4) (hours->seconds 1) (hours->seconds 2))))
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(assert (not (time-matches? (hours->seconds 1) (hours->seconds 4) (hours->seconds 2))))
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