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

---
 time.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'time.c')

diff --git a/time.c b/time.c
index 050a52615f..bd79110c5e 100644
--- a/time.c
+++ b/time.c
@@ -2150,8 +2150,10 @@ utc_offset_arg(VALUE arg)
         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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