Sync with 1.7.4.2

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.7.4.2.txt

@@ -12,6 +12,10 @@ Fixes since v1.7.4.1
    tiny packfiles.  We now close the file descriptor early when the entire
    packfile fits inside one mmap window.
 
+ * "git bisect visualize" tried to run "gitk" in windowing
+   environments even when "gitk" is not installed, resulting in a
+   strange error message.
+
  * "git clone /no/such/path" did not fail correctly.
 
  * "git commit" did not correctly error out when the user asked to use a
@@ -45,6 +49,9 @@ Fixes since v1.7.4.1
 
  * gitweb's "highlight" interface mishandled tabs.
 
+ * gitweb didn't understand timezones with GMT offset that is not
+   multiple of a whole hour.
+
  * gitweb had a few forward-incompatible syntactic constructs and
    also used incorrect variable when showing the file mode in a diff.
 

gitweb/gitweb.perl

@@ -2921,8 +2921,10 @@ sub parse_date {
 	$date{'iso-8601'}  = sprintf "%04d-%02d-%02dT%02d:%02d:%02dZ",
 	                     1900+$year, 1+$mon, $mday, $hour ,$min, $sec;
 
-	$tz =~ m/^([+\-][0-9][0-9])([0-9][0-9])$/;
-	my $local = $epoch + ((int $1 + ($2/60)) * 3600);
+	my ($tz_sign, $tz_hour, $tz_min) =
+		($tz =~ m/^([-+])(\d\d)(\d\d)$/);
+	$tz_sign = ($tz_sign eq '-' ? -1 : +1);
+	my $local = $epoch + $tz_sign*((($tz_hour*60) + $tz_min)*60);
 	($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($local);
 	$date{'hour_local'} = $hour;
 	$date{'minute_local'} = $min;