https://git.ruby-lang.org/ruby.git/commit/?id=542a1ade80

From 542a1ade8033d03513647ace64e50dbf31cb5e68 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 3 Sep 2019 11:31:14 +0900
Subject: --date=iso-local does not work with old git


diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index 620ac1b..65eb774 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -618,9 +618,15 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/lib/vcs.rb#L618
     end
 
     def format_changelog(path, arg)
-      cmd = %W"#{COMMAND} log --format=medium --notes=commits --date=iso-local --topo-order"
+      env = {'TZ' => 'JST-9', 'LANG' => 'C', 'LC_ALL' => 'C'}
+      cmd = %W"#{COMMAND} log --format=medium --notes=commits --topo-order"
+      date = "--date=iso-local"
+      unless system(env, *cmd, date, chdir: @srcdir, out: NullDevice, exception: false)
+        date = "--date=iso"
+      end
+      cmd << date
       cmd.concat(arg)
-      system({'TZ' => 'JST-9', 'LANG' => 'C', 'LC_ALL' => 'C'}, *cmd, chdir: @srcdir, out: path)
+      system(env, *cmd, chdir: @srcdir, out: path)
     end
 
     def upstream
-- 
cgit v0.10.2


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