[PATCH] git-svn: fix localtime=true on non-glibc environments

[Ryuichi Kokubo <ryu1kkb@gmail.com>]

git svn uses POSIX::strftime('%s', $sec, $min, ...) to make unix epoch time.
But lowercase %s formatting character is a GNU extention. This causes problem
in git svn fetch --localtime on non-glibc systems, such as msys or cygwin.
Using Time::Local::timelocal($sec, $min, ...) fixes it.

Signed-off-by: Ryuichi Kokubo <ryu1kkb@gmail.com>

Notes:
    lowercase %s format character in strftime is a GNU extension and not widely supported.
    POSIX::strftime affected by underlying crt's strftime because POSIX::strftime just calls crt's one.
    Time::Local is good function to replace POSIX::strftime because it's a perl core module function.
    
    Document about Time::Local.
     http://perldoc.perl.org/Time/Local.html
    
    These are specifications of strftime.
    
    The GNU C Library Reference Manual.
     http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html
    
    perl POSIX module's strftime document. It does not have '%s'.
     http://perldoc.perl.org/POSIX.html
    
    strftime document of Microsort Windows C Run-Time library.
     https://msdn.microsoft.com/en-us/library/fe06s4ak.aspx
    
    The Open Group's old specification does not have '%s' too.
     http://pubs.opengroup.org/onlinepubs/007908799/xsh/strftime.html
    
    On my environment, following problems happened.
    - msys   : git svn fetch does not progress at all with perl.exe consuming CPU.
    - cygwin : git svn fetch progresses but time stamp information is dropped.
       Every commits have unix epoch timestamp.
    
    I would like to thank git developer and contibutors.
    git helps me so much everyday.
    Thank you.
---
 perl/Git/SVN.pm |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/perl/Git/SVN.pm b/perl/Git/SVN.pm
index 8e4af71..f243726 100644
--- a/perl/Git/SVN.pm
+++ b/perl/Git/SVN.pm
@@ -14,6 +14,7 @@ use IPC::Open3;
 use Memoize;  # core since 5.8.0, Jul 2002
 use Memoize::Storable;
 use POSIX qw(:signal_h);
+use Time::Local;
 
 use Git qw(
     command
@@ -1332,7 +1333,7 @@ sub parse_svn_date {
 		$ENV{TZ} = 'UTC';
 
 		my $epoch_in_UTC =
-		    POSIX::strftime('%s', $S, $M, $H, $d, $m - 1, $Y - 1900);
+		    Time::Local::timelocal($S, $M, $H, $d, $m - 1, $Y - 1900);
 
 		# Determine our local timezone (including DST) at the
 		# time of $epoch_in_UTC.  $Git::SVN::Log::TZ stored the
-- 
1.7.10.4