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#| rep.util.time -- time conversion functions
$Id: time.jl,v 1.1 2000/09/07 09:12:16 john Exp $
Copyright (C) 2000 John Harper <john@dcs.warwick.ac.uk>
This file is part of librep.
librep 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 2, or (at your option)
any later version.
librep 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 librep; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|#
(define-structure rep.util.time
(export seconds-per-day
time->seconds
seconds->time
time-)
(open rep)
(defconst seconds-per-day 86400)
(define (time->seconds time)
"Convert the timestamp TIME to the number of seconds since the epoch."
(+ (* (car time) seconds-per-day) (cdr time)))
(define (seconds->time secs)
"Convert the number of secs past the epoch, SECS, to a timestamp."
(cons (quotient secs seconds-per-day) (mod secs seconds-per-day)))
(define (time- t1 t2)
"Return the number of seconds difference between timestamps T1 and T2."
(- (time->seconds t1) (time->seconds t2))))
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