https://git.ruby-lang.org/ruby.git/commit/?id=296a2cab07

From 296a2cab07ce530809ee74dee61180fbb3ca6f91 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 16 Feb 2021 19:36:20 +0900
Subject: Parse "-00:00" as UTC for the round-trip [Feature #17544]

---
 test/ruby/test_time_tz.rb | 2 ++
 time.c                    | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/test/ruby/test_time_tz.rb b/test/ruby/test_time_tz.rb
index 3783890..fdc9e11 100644
--- a/test/ruby/test_time_tz.rb
+++ b/test/ruby/test_time_tz.rb
@@ -261,6 +261,8 @@ class TestTimeTZ < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_time_tz.rb#L261
     assert_predicate(Time.new(2019, 1, 1, 0, 0, 0, "UTC"), :utc?)
     assert_predicate(Time.new(2019, 1, 1, 0, 0, 0, "utc"), :utc?)
     assert_predicate(Time.new(2019, 1, 1, 0, 0, 0, "Z"), :utc?)
+    assert_predicate(Time.new(2019, 1, 1, 0, 0, 0, "-00:00"), :utc?)
+    assert_not_predicate(Time.new(2019, 1, 1, 0, 0, 0, "+00:00"), :utc?)
   end
 
   def test_military_names
diff --git a/time.c b/time.c
index 050a526..bd79110 100644
--- a/time.c
+++ b/time.c
@@ -2150,8 +2150,10 @@ utc_offset_arg(VALUE arg) https://github.com/ruby/ruby/blob/trunk/time.c#L2150
         if (s[0] != '+' && s[0] != '-') goto invalid_utc_offset;
         if (!ISDIGIT(s[1]) || !ISDIGIT(s[2])) goto invalid_utc_offset;
         n += (s[1] * 10 + s[2] - '0' * 11) * 3600;
-        if (s[0] == '-')
+        if (s[0] == '-') {
+            if (n == 0) return UTC_ZONE;
             n = -n;
+        }
         return INT2FIX(n);
     }
     else {
-- 
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