[ruby/date] Revert "Simplify #inspect"

This reverts commit af01edd7d8575f544f647dbe8cde5b6ae535d459.

Revert requested by Yui Naruse.

https://github.com/ruby/date/commit/875d563557

ext/date/date_core.c

@@ -6574,8 +6574,11 @@ static VALUE
 mk_inspect(union DateData *x, VALUE klass, VALUE to_s)
 {
     return rb_enc_sprintf(rb_usascii_encoding(),
-			  "#<%"PRIsVALUE": %"PRIsVALUE">",
-			  klass, to_s);
+			  "#<%"PRIsVALUE": %"PRIsVALUE" "
+			  "((%+"PRIsVALUE"j,%ds,%+"PRIsVALUE"n),%+ds,%.0fj)>",
+			  klass, to_s,
+			  m_real_jd(x), m_df(x), m_sf(x),
+			  m_of(x), m_sg(x));
 }
 
 /*

test/date/test_switch_hitter.rb

@@ -282,10 +282,8 @@ class TestSH < Test::Unit::TestCase
   def test_inspect
     d = Date.new(2001, 2, 3)
     assert_equal(Encoding::US_ASCII, d.inspect.encoding)
-    assert_equal('#<Date: 2001-02-03>', d.inspect)
     d = DateTime.new(2001, 2, 3)
     assert_equal(Encoding::US_ASCII, d.inspect.encoding)
-    assert_equal('#<DateTime: 2001-02-03T00:00:00+00:00>', d.inspect)
   end
 
   def test_strftime