From b8004d01be10ba66aabf78039bc25e3934e043e6 Mon Sep 17 00:00:00 2001
From: ytjmt <46666464+ytjmt@users.noreply.github.com>
Date: Sat, 15 Oct 2022 15:48:06 +0900
Subject: [PATCH] Add specs for Time#strftime supporting RFC 3339 UTC for
 unknown offset local time

---
 core/time/strftime_spec.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/core/time/strftime_spec.rb b/core/time/strftime_spec.rb
index 1bd24b0538..c133e22008 100644
--- a/core/time/strftime_spec.rb
+++ b/core/time/strftime_spec.rb
@@ -49,4 +49,13 @@
     time = @new_time_with_offset[2012, 1, 1, 0, 0, 0, Rational(36645, 10)]
     time.strftime("%::z").should == "+01:01:05"
   end
+
+  ruby_version_is "3.1" do
+    it "supports RFC 3339 UTC for unknown offset local time, -0000, as %-z" do
+      @time.strftime("%z").should == "+0000"
+      @time.strftime("%-z").should == "-0000"
+      @time.strftime("%-:z").should == "-00:00"
+      @time.strftime("%-::z").should == "-00:00:00"
+    end
+  end
 end