From: Zefram <zefram@fysh.org>
To: 21906@debbugs.gnu.org
Subject: bug#21906: julian-day->date negative input breakage
Date: Fri, 13 Nov 2015 14:31:04 +0000 [thread overview]
Message-ID: <20151113143104.GP13455@fysh.org> (raw)
scheme@(guile-user)> (use-modules (srfi srfi-19))
scheme@(guile-user)> (julian-day->date 0 0)
$1 = #<date nanosecond: 0 second: 0 minute: 0 hour: 12 day: 24 month: 11 year: -4714 zone-offset: 0>
scheme@(guile-user)> (julian-day->date -1 0)
$2 = #<date nanosecond: 0 second: 0 minute: 0 hour: -12 day: 24 month: 11 year: -4714 zone-offset: 0>
scheme@(guile-user)> (julian-day->date -100000 0)
$3 = #<date nanosecond: 0 second: 0 minute: 0 hour: -12 day: -19 month: 3 year: -4987 zone-offset: 0>
scheme@(guile-user)> (julian-day->date -10000000 0)
$4 = #<date nanosecond: 0 second: 0 minute: 0 hour: -12 day: -30 month: 0 year: -32092 zone-offset: 0>
Observe the various erroneous field values: negative hour, negative
day-of-month, zero month. These occur in general for various negative
JD inputs. Not only should the conversion not produce these kinds of
values, the date structure type probably ought to reject them if they
get that far.
-zefram
next reply other threads:[~2015-11-13 14:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-13 14:31 Zefram [this message]
2018-10-21 3:20 ` bug#21906: julian-day->date negative input breakage Mark H Weaver
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