https://git.ruby-lang.org/ruby.git/commit/?id=b98aa3aaae

From b98aa3aaaee29f86518cf3b70f3611bdc346ea17 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 4 Apr 2021 22:44:23 +0000
Subject: merge revision(s) 2f1895fa: [Backport #16767]

	Fixed formatted substring expansion [Bug #16767]

	---
	 strftime.c             | 2 ++
	 test/ruby/test_time.rb | 7 +++++++
	 2 files changed, 9 insertions(+)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 strftime.c             | 2 ++
 test/ruby/test_time.rb | 7 +++++++
 version.h              | 2 +-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/strftime.c b/strftime.c
index dd2b21f..446be7d 100644
--- a/strftime.c
+++ b/strftime.c
@@ -326,7 +326,9 @@ rb_strftime_with_timespec(VALUE ftime, const char *format, size_t format_len, https://github.com/ruby/ruby/blob/trunk/strftime.c#L326
 			s += len; \
 			if (i > 0) case_conv(s, i, flags); \
 			if (precision > i) {\
+				s += i; \
 				NEEDS(precision); \
+				s -= i; \
 				memmove(s + precision - i, s, i);\
 				memset(s, padding ? padding : ' ', precision - i); \
 				s += precision;	\
diff --git a/test/ruby/test_time.rb b/test/ruby/test_time.rb
index 2bd4bc8..6a55af1 100644
--- a/test/ruby/test_time.rb
+++ b/test/ruby/test_time.rb
@@ -851,6 +851,13 @@ class TestTime < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_time.rb#L851
     assert_equal(8192, Time.now.strftime('%8192z').size)
   end
 
+  def test_strftime_wide_precision
+    t2000 = get_t2000
+    s = t2000.strftime("%28c")
+    assert_equal(28, s.size)
+    assert_equal(t2000.strftime("%c"), s.strip)
+  end
+
   def test_strfimte_zoneoffset
     t2000 = get_t2000
     t = t2000.getlocal("+09:00:00")
diff --git a/version.h b/version.h
index 76a6117..395ec2a 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.7"
 #define RUBY_RELEASE_DATE "2021-04-05"
-#define RUBY_PATCHLEVEL 175
+#define RUBY_PATCHLEVEL 176
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 4
-- 
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