https://git.ruby-lang.org/ruby.git/commit/?id=f9f7f3a75e

From f9f7f3a75ec5af4a70e3332f8f5aa300c13432e2 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Tue, 27 Jul 2021 10:23:47 -0700
Subject: [ruby/date] Make %v strftime flag use uppercase month

%v is supposed to be the VMS date, and VMS date format uses an
uppercase month.

Ruby 1.8 used an uppercase month for %v, but the behavior was
changed without explanation in r31672.

Time#strftime still uses an uppercase month for %v, so this change
makes Date#strftime consistent with Time#strftime.

Fixes [Bug #13810]

https://github.com/ruby/date/commit/56c489fd7e
---
 ext/date/date_core.c            | 4 ++--
 ext/date/date_strftime.c        | 2 +-
 test/date/test_date_strftime.rb | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index f1017d22e9..4a2225fd2c 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -6900,7 +6900,7 @@ date_strftime_internal(int argc, VALUE *argv, VALUE self, https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L6900
  *      %c - date and time (%a %b %e %T %Y)
  *      %D - Date (%m/%d/%y)
  *      %F - The ISO 8601 date format (%Y-%m-%d)
- *      %v - VMS date (%e-%b-%Y)
+ *      %v - VMS date (%e-%^b-%Y)
  *      %x - Same as %D
  *      %X - Same as %T
  *      %r - 12-hour time (%I:%M:%S %p)
@@ -8380,7 +8380,7 @@ dt_lite_to_s(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L8380
  *      %c - date and time (%a %b %e %T %Y)
  *      %D - Date (%m/%d/%y)
  *      %F - The ISO 8601 date format (%Y-%m-%d)
- *      %v - VMS date (%e-%b-%Y)
+ *      %v - VMS date (%e-%^b-%Y)
  *      %x - Same as %D
  *      %X - Same as %T
  *      %r - 12-hour time (%I:%M:%S %p)
diff --git a/ext/date/date_strftime.c b/ext/date/date_strftime.c
index 9d8167b612..d7f28989d6 100644
--- a/ext/date/date_strftime.c
+++ b/ext/date/date_strftime.c
@@ -393,7 +393,7 @@ date_strftime_with_tmx(char *s, const size_t maxsize, const char *format, https://github.com/ruby/ruby/blob/trunk/ext/date/date_strftime.c#L393
 	    continue;
 
 	  case 'v':
-	    STRFTIME("%e-%b-%Y");
+	    STRFTIME("%e-%^b-%Y");
 	    continue;
 
 	  case 'w':	/* weekday, Sunday == 0, 0 - 6 */
diff --git a/test/date/test_date_strftime.rb b/test/date/test_date_strftime.rb
index f82874d26d..be9354504a 100644
--- a/test/date/test_date_strftime.rb
+++ b/test/date/test_date_strftime.rb
@@ -48,7 +48,7 @@ class TestDateStrftime < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/date/test_date_strftime.rb#L48
     '%t'=>["\t",{}],
     '%u'=>['6',{:cwday=>6}],
     '%V'=>['05',{:cweek=>5}],
-    '%v'=>[' 3-Feb-2001',{:mday=>3,:mon=>2,:year=>2001}],
+    '%v'=>[' 3-FEB-2001',{:mday=>3,:mon=>2,:year=>2001}],
     '%z'=>['+0000',{:zone=>'+0000',:offset=>0}],
     '%+'=>['Sat Feb  3 00:00:00 +00:00 2001',
       {:wday=>6,:mon=>2,:mday=>3,
-- 
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