https://git.ruby-lang.org/ruby.git/commit/?id=9eb798a3f1

From 9eb798a3f1de6a9e08e510904d376952d5e94d50 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Wed, 17 Jul 2019 14:53:55 -0700
Subject: [ruby/date] Make julian dates roundtrip through to_time.to_date

Previously, julian dates would not round trip through to_time.to_date,
because Time is always considered gregorian.  This converts the Date
instance from julian to gregorian before converting to Time, ensuring
that an equal date object will be returned if converting that Time
back to Date.

This does result in julian Date objects showing different day values
if converting to Time.

Fixes Ruby Bug 8428.

https://github.com/ruby/date/commit/d8df64555e

diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index 388b30b..71d0da5 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -8555,17 +8555,24 @@ time_to_datetime(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L8555
  * call-seq:
  *    d.to_time  ->  time
  *
- * Returns a Time object which denotes self.
+ * Returns a Time object which denotes self. If self is a julian date,
+ * convert it to a gregorian date before converting it to Time.
  */
 static VALUE
 date_to_time(VALUE self)
 {
-    get_d1(self);
+    get_d1a(self);
+
+    if (m_julian_p(adat)) {
+        VALUE tmp = d_lite_gregorian(self);
+        get_d1b(tmp);
+        adat = bdat;
+    }
 
     return f_local3(rb_cTime,
-		    m_real_year(dat),
-		    INT2FIX(m_mon(dat)),
-		    INT2FIX(m_mday(dat)));
+        m_real_year(adat),
+        INT2FIX(m_mon(adat)),
+        INT2FIX(m_mday(adat)));
 }
 
 /*
diff --git a/test/date/test_date_conv.rb b/test/date/test_date_conv.rb
index 5c295da..d41ff45 100644
--- a/test/date/test_date_conv.rb
+++ b/test/date/test_date_conv.rb
@@ -48,6 +48,24 @@ class TestDateConv < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/date/test_date_conv.rb#L48
 		 [t.year, t.mon, t.mday, t.hour, t.min, t.sec, t.usec])
   end
 
+  def test_to_time_to_date_roundtrip__from_gregorian_date
+    d = Date.new(1582, 10, 15)
+    t = d.to_time
+    assert_equal([1582, 10, 15, 0, 0, 0, 0],
+		 [t.year, t.mon, t.mday, t.hour, t.min, t.sec, t.usec])
+    assert_equal(d, t.to_date)
+    assert_equal(d.jd, t.to_date.jd)
+  end
+
+  def test_to_time_to_date_roundtrip__from_julian_date
+    d = Date.new(1582, 10, 4)
+    t = d.to_time
+    assert_equal([1582, 10, 14, 0, 0, 0, 0],
+		 [t.year, t.mon, t.mday, t.hour, t.min, t.sec, t.usec])
+    assert_equal(d, t.to_date)
+    assert_equal(d.jd, t.to_date.jd)
+  end
+
   def test_to_time__from_datetime
     d = DateTime.new(2004, 9, 19, 1, 2, 3, 8.to_r/24) + 456789.to_r/86400000000
     t = d.to_time
-- 
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