From 91a7af3e48b7e36bd937998e7076c3fe2e812de2 Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <solipsis@pitrou.net>
Date: Sat, 23 Nov 2013 15:23:26 +0100
Subject: [PATCH] Issue #19727: os.utime(..., None) is now potentially more
 precise under Windows.

---
 Misc/NEWS             | 3 +++
 Modules/posixmodule.c | 9 ++-------
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/Misc/NEWS b/Misc/NEWS
index 93301ffc57b..3cfe2347a67 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -68,6 +68,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #19727: os.utime(..., None) is now potentially more precise
+  under Windows.
+
 - Issue #17201: ZIP64 extensions now are enabled by default.  Patch by
   William Mallard.
 
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 71b14373943..4c96204158a 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -4953,13 +4953,8 @@ posix_utime(PyObject *self, PyObject *args, PyObject *kwargs)
     }
 
     if (utime.now) {
-        SYSTEMTIME now;
-        GetSystemTime(&now);
-        if (!SystemTimeToFileTime(&now, &mtime) ||
-            !SystemTimeToFileTime(&now, &atime)) {
-            PyErr_SetFromWindowsErr(0);
-            goto exit;
-        }
+        GetSystemTimeAsFileTime(&mtime);
+        atime = mtime;
     }
     else {
         time_t_to_FILE_TIME(utime.atime_s, utime.atime_ns, &atime);