mirrors/git
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

perl: call timegm and timelocal with 4-digit year

Browse Source 
Amazingly, timegm(gmtime(0)) is only 0 before 2020 because perl's
timegm deviates from GNU timegm(3) in how it handles years.

man Time::Local says

 Whenever possible, use an absolute four digit year instead.

with a detailed explanation about ambiguity of 2-digit years above that.

Even though this ambiguity is error-prone with >50% of users getting it
wrong, it has been like this for 20+ years, so we just use 4-digit years
everywhere to be on the safe side.

We add some extra logic to cvsimport because it allows 2-digit year
input and interpreting an 18 as 1918 can be avoided easily and safely.

Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Bernhard M. Wiedemann
2018-02-23 18:20:45 +01:00
committed by Junio C Hamano
parent ffa9524972
commit a40e06ee33
4 changed files with 8 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
contrib/examples/git-svnimport.perl
View File

@ -238,7 +238,7 @@ sub pdate($) {
my($d) = @_;
$d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
or die "Unparseable date: $d\n";
my $y=$1; $y-=1900 if $y>1900;
my $y=$1; $y+=1900 if $y<1000;
return timegm($6||0,$5,$4,$3,$2-1,$y);
}