| Subject: | After 2018-DEC-31T23:59:59, Date::Parse::str2time returns wrong value for dates before 1970-01-01T00:00:00 |
| Date: | Tue, 1 Jan 2019 00:01:29 -0600 |
| To: | bug-TimeDate [...] rt.cpan.org |
| From: | Jeff Holt <jeffrey.l.holt [...] gmail.com> |
The str2time function returns the wrong value as soon as the system clock
reaches 01-JAN-2019T00:00:00.000000. But it apparently only does so for
time values that precede 01-JAN-1970T00:00:00.000000.
I've tested version 2.30 of TimeDate with ActivePerl 5.20.2.2001,
5.26.3.2603, and 5.28.1 (built from source) on macos. I've also tested
5.26.3.2603 on mswin64 and linux64 with TimeDate 2.30 and gotten the same
incorrect results.
To execute the test, you install perl and TimeDate. Then you execute the
following t.sh, which does 3 things:
1. prints perl path and perl version
2. changes system date to 31-DEC-2018T23:59:59
3. executes a loop printing date and running the t.pl perl script.
Note that I expect t.pl to exit with 1 as I stated above. If you cannot
reproduce the failure, then you'll have to interrupt the execution once it
becomes clear you won't reproduce the results.
Here's t.sh:
which perl
perl -v
sudo date 123123592018.58
while [ 1 ]; do
date
perl t.pl > t.out 2>&1
if [ $? -ne 0 ]; then
cat t.out
rm t.out
break
fi
done
Here's t.pl:
use Date::Parse qw(str2time);
my %tests = (
"1969-08-16T14:00:00.000000" => "-11854800",
"1969-08-18T03:00:00.000000" => "-11721600",
"1969-12-31T23:59:59.999999" => "21599.999999",
"1970-01-01T00:00:00.000000" => "21600",
);
my $fail = 0;
while (my ($s, $expect) = each %tests) {
my $got = str2time($s);
my $result = $expect eq $got ? "OK" : "FAIL";
print "$result s='$s' expect='$expect' got='$got'\n";
$fail = 1 if $result ne "OK";
}
exit ($fail ? 1 : 0);
When I execute t.sh, I get the following consistently on my MacBook Pro
running Mojave (10.14.2). Notice that sudo will complain about the local
time being in the future, this should havd no effect on the test outcome:
$ sh t.sh
/usr/local/bin/perl
This is perl 5, version 28, subversion 1 (v5.28.1) built for darwin-2level
Copyright 1987-2018, Larry Wall
Perl may be copied only under the terms of either the Artistic License or
the
GNU General Public License, which may be found in the Perl 5 source kit.
Complete documentation for Perl, including FAQ lists, should be found on
this system using "man perl" or "perldoc perl". If you have access to the
Internet, point your browser at http://www.perl.org/, the Perl Home Page.
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OK s='1970-01-01T00:00:00.000000' expect='21600' got='21600'
FAIL s='1969-12-31T23:59:59.999999' expect='21599.999999' got='3155781600'
FAIL s='1969-08-16T14:00:00.000000' expect='-11854800' got='3143905200'
FAIL s='1969-08-18T03:00:00.000000' expect='-11721600' got='3144038400'