https://git.ruby-lang.org/ruby.git/commit/?id=afacf85e44

From afacf85e443cc64dd41c248659b65476434b4175 Mon Sep 17 00:00:00 2001
From: "S.H" <gamelinks007@g...>
Date: Thu, 23 Jul 2020 11:35:20 +0900
Subject: Merge pull request #3352 from S-H-GAMELINKS/bug/17042-strftime

Fix Time#strftime with timezone [Bug #17042]

diff --git a/time.c b/time.c
index 8d72068..e993d78 100644
--- a/time.c
+++ b/time.c
@@ -5109,6 +5109,10 @@ time_strftime(VALUE time, VALUE format) https://github.com/ruby/ruby/blob/trunk/time.c#L5109
     VALUE tmp;
 
     GetTimeval(time, tobj);
+    if (tobj->vtm.yday == 0) {
+        VALUE zone = tobj->vtm.zone;
+        if (!NIL_P(zone)) zone_localtime(zone, time);
+    }
     MAKE_TM(time, tobj);
     StringValue(format);
     if (!rb_enc_str_asciicompat_p(format)) {
-- 
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