--- a/test/logger/test_logdevice.rb	Sat Jun 10 10:10:01 2017
+++ b/test/logger/test_logdevice.rb	Sat Jun 10 22:36:29 2017
@@ -684,35 +684,60 @@
     end
   end if env_tz_works

+  # Some windows configurations do not allow software to change the mtime of
+  # a file.  The LogDevice uses on mtime for time interval based log files.
+  # In use this isn't an issue, but this test need to mock it.  Hence, for MinGW
+  # builds, it prepends LogDevice.initialize (and uses atime). It may need
+  # revision if the actual method is updated.
+  #
   def test_shifting_midnight_exist_file
-    Dir.mktmpdir do |tmpdir|
+    dir = Dir.mktmpdir
+    Dir.chdir(dir) do |tmpdir|
+      log_ext = Time.now.strftime("log.%Y%m%d")
       assert_in_out_err([*%W"--disable=gems -rlogger -C#{tmpdir} -"], "#{<<-"begin;"}\n#{<<-'end;'}")
       begin;
+        real_time = Time.now
         begin
-          module FakeTime
-            attr_accessor :now
+          Time.singleton_class.prepend(Module.new { attr_accessor :now } )
+          if /mingw/ =~ RUBY_PLATFORM
+            Logger::LogDevice.prepend( Module.new do
+              def initialize(log = nil, shift_age: nil, shift_size: nil, shift_period_suffix: nil)
+                @dev = @filename = @shift_age = @shift_size = @shift_period_suffix = nil
+                mon_initialize
+                set_dev(log)
+                if @filename
+                  @shift_age = shift_age || 7
+                  @shift_size = shift_size || 1048576
+                  @shift_period_suffix = shift_period_suffix || '%Y%m%d'
+                  unless @shift_age.is_a?(Integer)
+                    base_time = @dev.respond_to?(:stat) ? @dev.stat.atime : Time.now
+                    @next_rotate_time = next_rotate_time(base_time, @shift_age)
+                  end
+                end
+              end
+            end)
           end

-          class << Time
-            prepend FakeTime
+          # check for DST match at next midnight, else use previous
+          if real_time.dst? == (real_time + 24 * 60 * 60).dst?
+            ta = (real_time + 24 * 60 * 60).to_a
+          else
+            ta = real_time.to_a
           end

+          tomorrow = [ ta[5], ta[4], ta[3] ]
           log = "log"
-          File.open(log, "w") {}
-          File.utime(*[Time.mktime(2014, 1, 2, 0, 0, 0)]*2, log)
+          delta =  0.500                            # +/- midnight delta seconds

-          Time.now = Time.mktime(2014, 1, 2, 23, 59, 59, 999000)
+          Time.now = Time.local(*tomorrow, 0, 0, 0) - delta   # midnight - delta
           dev = Logger::LogDevice.new(log, shift_age: 'daily')
           dev.write("#{Time.now} hello-1\n")
-          dev.close
           File.utime(Time.now, Time.now, log)

-          Time.now = Time.mktime(2014, 1, 3, 1, 1, 1)
-          dev = Logger::LogDevice.new(log, shift_age: 'daily')
+          Time.now = Time.local(*tomorrow, 0, 0, delta)       # midnight + delta
           dev.write("#{Time.now} hello-2\n")
-          File.utime(Time.now, Time.now, log)
         ensure
-          dev.close
+          dev.close if dev
         end
       end;

@@ -721,9 +746,10 @@
       cont = File.read(log)
       assert_match(/hello-2/, cont)
       assert_not_match(/hello-1/, cont)
-      assert_file.for(bug).exist?(log+".20140102")
-      assert_match(/hello-1/, File.read(log+".20140102"), bug)
+      assert_file.for(bug).exist?(log_ext)
+      assert_match(/hello-1/, File.read(log_ext), bug)
     end
+    FileUtils.remove_entry dir                           # comment to view files
   end

   env_tz_works = /linux|darwin|freebsd/ =~ RUBY_PLATFORM # borrow from test/ruby/test_time_tz.rb