Index: Lib/test/test_datetime.py
===================================================================
--- Lib/test/test_datetime.py	(revision 62989)
+++ Lib/test/test_datetime.py	(working copy)
@@ -1453,6 +1453,16 @@
         got = self.theclass.utcfromtimestamp(ts)
         self.verify_field_equality(expected, got)
 
+    def test_totimestamp(self):
+        import time
+
+        now = self.theclass.now()
+        seconds = time.mktime(now.timetuple())
+        seconds += now.microsecond / 1000000.0
+        timestamp = now.totimestamp()
+
+        self.assertEquals(seconds,timestamp)
+
     def test_microsecond_rounding(self):
         # Test whether fromtimestamp "rounds up" floats that are less
         # than one microsecond smaller than an integer.
Index: Modules/datetimemodule.c
===================================================================
--- Modules/datetimemodule.c	(revision 62989)
+++ Modules/datetimemodule.c	(working copy)
@@ -4516,6 +4516,39 @@
 	return build_struct_time(y, m, d, hh, mm, ss, 0);
 }
 
+#ifdef HAVE_MKTIME
+/* datetime_totimestamp will fail if time.mktime(...) is not defined. */
+
+static PyObject *
+datetime_totimestamp(PyDateTime_DateTime *self)
+{
+    PyObject *timetuple = NULL;
+    PyObject *timestamp = NULL;
+    PyObject *ms_timestamp = NULL;
+
+    timetuple = datetime_timetuple(self);
+    if (timetuple == NULL)
+        return NULL;
+
+	PyObject *time = PyImport_ImportModuleNoBlock("time");
+	if (time != NULL) {
+		timestamp = PyObject_CallMethod(time, "mktime", "O", timetuple);
+		Py_DECREF(time);
+	}
+    else
+        return NULL; /* failed to import time module */
+
+    if (timestamp == NULL)
+        return NULL; /* call to time.mktime(..) failed */
+
+    ms_timestamp = PyNumber_Add(timestamp,
+        PyFloat_FromDouble((double) DATE_GET_MICROSECOND(self) / 1000000.0)
+    );
+    
+    return ms_timestamp;
+}
+#endif /* HAVE_MKTIME */
+
 /* Pickle support, a simple use of __reduce__. */
 
 /* Let basestate be the non-tzinfo data string.
@@ -4597,6 +4630,11 @@
 	{"utctimetuple",   (PyCFunction)datetime_utctimetuple, METH_NOARGS,
          PyDoc_STR("Return UTC time tuple, compatible with time.localtime().")},
 
+#ifdef HAVE_MKTIME
+	{"totimestamp",   (PyCFunction)datetime_totimestamp, METH_NOARGS,
+         PyDoc_STR("Return timestamp as seconds and milliseconds since epoch.")},
+#endif /* HAVE_MKTIME */
+
 	{"isoformat",   (PyCFunction)datetime_isoformat, METH_VARARGS | METH_KEYWORDS,
 	 PyDoc_STR("[sep] -> string in ISO 8601 format, "
 	 	   "YYYY-MM-DDTHH:MM:SS[.mmmmmm][+HH:MM].\n\n"