Index: Modules/datetimemodule.c
===================================================================
--- Modules/datetimemodule.c	(révision 67177)
+++ Modules/datetimemodule.c	(copie de travail)
@@ -4527,6 +4527,37 @@
 	return build_struct_time(y, m, d, hh, mm, ss, 0);
 }
 
+static PyObject *
+datetime_totimestamp(PyObject *self)
+{
+	PyObject *timetuple, *time;
+	PyObject *timet, *us, *timestamp;
+
+	/* create the time tuple */
+	timetuple = datetime_timetuple((PyDateTime_DateTime *)self);
+	if (timetuple == NULL)
+		return NULL;
+
+	/* call time.mktime(tuple) */
+	time = PyImport_ImportModuleNoBlock("time");
+	if (time == NULL)
+		return NULL;
+	timet = PyObject_CallMethod(time, "mktime", "O", timetuple);
+	Py_DECREF(timetuple);
+	Py_DECREF(time);
+	if (timet == NULL)
+		return NULL;
+
+	/* add microseconds / 1e6 */
+	us = PyFloat_FromDouble(DATE_GET_MICROSECOND(self) * 1e-6);
+	timestamp = PyNumber_Add(timet, us);
+	Py_DECREF(timet);
+	Py_DECREF(us);
+
+	return timestamp;
+}
+
+
 /* Pickle support, a simple use of __reduce__. */
 
 /* Let basestate be the non-tzinfo data string.
@@ -4579,6 +4610,11 @@
 	 PyDoc_STR("timestamp -> UTC datetime from a POSIX timestamp "
 	 	   "(like time.time()).")},
 
+	{"totimestamp", (PyCFunction)datetime_totimestamp,
+	 METH_NOARGS,
+	 PyDoc_STR("Return a local POSIX timestamp:\n"
+		   "time.mktime(t.timetuple()) + t.microsecond/1e6")},
+
 	{"strptime", (PyCFunction)datetime_strptime,
 	 METH_VARARGS | METH_CLASS,
 	 PyDoc_STR("string, format -> new datetime parsed from a string "