https://git.ruby-lang.org/ruby.git/commit/?id=a9d4f2d03c

From a9d4f2d03c847ec1c89dc03a5076a9fa29ffa61f Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Fri, 21 Jun 2019 10:33:06 -0700
Subject: Support %U/%u/%W/%w/%V/%g/%G formats in Time.strptime

Most of these formats were documented as supported, but were not
actually supported. Document that %g and %G are supported.

If %U/%W is specified without yday and mon/mday are not specified,
then Date.strptime is used to get the appropriate yday.

If cwyear is specifier without the year, or cwday and cweek are
specified without mday and mon, then use Date.strptime and convert
the resulting value to Time, since Time.make_time cannot handle
those conversions

Fixes [Bug #9836]
Fixes [Bug #14241]

diff --git a/lib/time.rb b/lib/time.rb
index b1d7553..f27bacd 100644
--- a/lib/time.rb
+++ b/lib/time.rb
@@ -397,6 +397,9 @@ class Time https://github.com/ruby/ruby/blob/trunk/lib/time.rb#L397
     # %D :: Date (%m/%d/%y)
     # %e :: Day of the month, blank-padded ( 1..31)
     # %F :: Equivalent to %Y-%m-%d (the ISO 8601 date format)
+    # %g :: The last two digits of the commercial year
+    # %G :: The week-based year according to ISO-8601 (week 1 starts on Monday
+    #       and includes January 4)
     # %h :: Equivalent to %b
     # %H :: Hour of the day, 24-hour clock (00..23)
     # %I :: Hour of the day, 12-hour clock (01..12)
@@ -456,7 +459,15 @@ class Time https://github.com/ruby/ruby/blob/trunk/lib/time.rb#L459
       else
         year = d[:year]
         year = yield(year) if year && block_given?
-        t = make_time(date, year, d[:yday], d[:mon], d[:mday], d[:hour], d[:min], d[:sec], d[:sec_fraction], d[:zone], now)
+        yday = d[:yday]
+        if (d[:cwyear] && !year) || ((d[:cwday] || d[:cweek]) && !(d[:mon] && d[:mday]))
+          # make_time doesn't deal with cwyear/cwday/cweek
+          return Date.strptime(date, format).to_time
+        end
+        if (d[:wnum0] || d[:wnum1]) && !yday && !(d[:mon] && d[:mday])
+          yday = Date.strptime(date, format).yday
+        end
+        t = make_time(date, year, yday, d[:mon], d[:mday], d[:hour], d[:min], d[:sec], d[:sec_fraction], d[:zone], now)
       end
       t
     end
diff --git a/test/test_time.rb b/test/test_time.rb
index e4fea31..ca20788 100644
--- a/test/test_time.rb
+++ b/test/test_time.rb
@@ -528,6 +528,17 @@ class TestTimeExtension < Test::Unit::TestCase # :nodoc: https://github.com/ruby/ruby/blob/trunk/test/test_time.rb#L528
     assert_equal(15, t.hour)
   end
 
+  def test_strptime_wuvg
+    assert_equal(Time.local(2019, 1, 30), Time.strptime("3 4 2019", "%w %W %Y"))
+    assert_equal(Time.local(2019, 2, 7), Time.strptime("4 5 2019", "%u %U %Y"))
+    assert_equal(Time.local(2019, 1, 28), Time.strptime("4 2019", "%W %Y"))
+    assert_equal(Time.local(2019, 2, 3), Time.strptime("5 2019", "%U %Y"))
+    assert_equal(Time.local(2019, 1, 1), Time.strptime("1 2 2019", "%V %w %G"))
+    assert_equal(Time.local(2016, 1, 1), Time.strptime("53 5 15", "%V %w %g"))
+    assert_equal(Time.local(2018, 12, 31), Time.strptime("1 2019", "%V %G"))
+    assert_equal(Time.local(2015, 12, 28), Time.strptime("53 15", "%V %g"))
+  end
+
   def test_nsec
     assert_equal(123456789, Time.parse("2000-01-01T00:00:00.123456789+00:00").tv_nsec)
   end
-- 
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