https://git.ruby-lang.org/ruby.git/commit/?id=99a9c3fe2e

From 99a9c3fe2eaab8157765d792dc871da6daea0327 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 12 Jul 2020 14:09:48 +0900
Subject: Fixed yday and wday with timezone [Bug #17024]


diff --git a/spec/ruby/core/time/new_spec.rb b/spec/ruby/core/time/new_spec.rb
index 3cafd46..1a2f93e 100644
--- a/spec/ruby/core/time/new_spec.rb
+++ b/spec/ruby/core/time/new_spec.rb
@@ -129,6 +129,10 @@ ruby_version_is "2.6" do https://github.com/ruby/ruby/blob/trunk/spec/ruby/core/time/new_spec.rb#L129
 
       time.zone.should == zone
       time.utc_offset.should == 5*3600+30*60
+      ruby_version_is "2.8" do
+        time.wday.should == 6
+        time.yday.should == 1
+      end
     end
 
     it "accepts timezone argument that must have #local_to_utc and #utc_to_local methods" do
diff --git a/test/ruby/test_time_tz.rb b/test/ruby/test_time_tz.rb
index a95f9e7..1d86d0c 100644
--- a/test/ruby/test_time_tz.rb
+++ b/test/ruby/test_time_tz.rb
@@ -604,6 +604,8 @@ module TestTimeTZ::WithTZ https://github.com/ruby/ruby/blob/trunk/test/ruby/test_time_tz.rb#L604
     assert_equal([2018, 9, 1, 12, 0, 0, tz], [t.year, t.mon, t.mday, t.hour, t.min, t.sec, t.zone])
     h, m = (-utc_offset / 60).divmod(60)
     assert_equal(time_class.utc(2018, 9, 1, 12+h, m, 0).to_i, t.to_i)
+    assert_equal(6, t.wday)
+    assert_equal(244, t.yday)
   end
 
   def subtest_now(time_class, tz, tzarg, tzname, abbr, utc_offset)
diff --git a/time.c b/time.c
index 1cdeeb8..b1dfce0 100644
--- a/time.c
+++ b/time.c
@@ -4580,14 +4580,15 @@ time_wday(VALUE time) https://github.com/ruby/ruby/blob/trunk/time.c#L4580
 
     GetTimeval(time, tobj);
     MAKE_TM(time, tobj);
+    if (tobj->vtm.wday == VTM_WDAY_INITVAL) {
+        VALUE zone = tobj->vtm.zone;
+        if (!NIL_P(zone)) zone_localtime(zone, time);
+    }
     return INT2FIX((int)tobj->vtm.wday);
 }
 
 #define wday_p(n) {\
-    struct time_object *tobj;\
-    GetTimeval(time, tobj);\
-    MAKE_TM(time, tobj);\
-    return (tobj->vtm.wday == (n)) ? Qtrue : Qfalse;\
+    return (time_wday(time) == INT2FIX(n)) ? Qtrue : Qfalse; \
 }
 
 /*
@@ -4719,6 +4720,10 @@ time_yday(VALUE time) https://github.com/ruby/ruby/blob/trunk/time.c#L4720
 
     GetTimeval(time, tobj);
     MAKE_TM(time, tobj);
+    if (tobj->vtm.yday == 0) {
+        VALUE zone = tobj->vtm.zone;
+        if (!NIL_P(zone)) zone_localtime(zone, time);
+    }
     return INT2FIX(tobj->vtm.yday);
 }
 
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