Index: Lib/test/test_datetime.py
===================================================================
--- Lib/test/test_datetime.py	(revision 74106)
+++ Lib/test/test_datetime.py	(working copy)
@@ -1120,6 +1120,12 @@
             # blow up because other fields are insane.
             self.theclass(base[:2] + chr(ord_byte) + base[3:])
 
+    def test_date_fromyday(self):
+        dt = date.fromyday(2009,200)
+        self.assertEqual(dt.day,19)
+        self.assertEqual(dt.month,7)
+        self.assertEqual(dt.year,2009)
+
 #############################################################################
 # datetime tests
 
@@ -1667,6 +1673,10 @@
         self.assertEqual(dt2.newmeth(-7), dt1.year + dt1.month +
                                           dt1.second - 7)
 
+    def test_yday(self):
+        t = datetime.today()
+        self.assertEqual(t.yday(), t.timetuple()[7])
+
 class SubclassTime(time):
     sub_var = 1
 
Index: Modules/datetimemodule.c
===================================================================
--- Modules/datetimemodule.c	(revision 74106)
+++ Modules/datetimemodule.c	(working copy)
@@ -2263,16 +2263,48 @@
 		}
 		return (PyObject *)me;
 	}
-
 	if (PyArg_ParseTupleAndKeywords(args, kw, "iii", date_kws,
 					&year, &month, &day)) {
 		if (check_date_args(year, month, day) < 0)
 			return NULL;
 		self = new_date_ex(year, month, day, type);
 	}
+
+
 	return self;
 }
 
+
+static char *dateyday_kws[] = {"year", "yday", NULL};
+
+/* Returns new date from year and yday */
+static PyObject *
+date_fromyday(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	int year;
+	int month;
+	int day;
+	int yday;
+
+        if(PyArg_ParseTupleAndKeywords(args, kw, "ii", dateyday_kws,
+					    &year, &yday)) {
+	        int days = 0;
+	        for(month=1; month<=12; ++month) {
+	               days += days_in_month(year,month);
+	               if(yday < days) {
+	                       break;
+	               }
+	        }
+	        day = abs(days_before_month(year,month) - yday);
+	        if (check_date_args(year,month,day))
+	               return NULL;
+	       self = new_date_ex(year, month, day, type);
+	}
+	return self;
+}
+
+
 /* Return new date from localtime(t). */
 static PyObject *
 date_local_from_time_t(PyObject *cls, double ts)
@@ -2603,6 +2635,14 @@
 }
 
 static PyObject *
+date_yday(PyDateTime_Date *self)
+{
+        return PyInt_FromLong(days_before_month(GET_YEAR(self),GET_MONTH(self)) 
+			 + GET_DAY(self));
+}
+
+
+static PyObject *
 date_replace(PyDateTime_Date *self, PyObject *args, PyObject *kw)
 {
 	PyObject *clone;
@@ -2688,6 +2728,10 @@
 	 PyDoc_STR("Current date or datetime:  same as "
 	 	   "self.__class__.fromtimestamp(time.time()).")},
 
+	{"fromyday", (PyCFunction)date_fromyday,
+	 METH_VARARGS | METH_KEYWORDS | METH_CLASS,
+	 PyDoc_STR("year, yday --> date from the year and yday")},
+
 	/* Instance methods: */
 
 	{"ctime",       (PyCFunction)date_ctime,        METH_NOARGS,
@@ -2702,6 +2746,9 @@
 	{"timetuple",   (PyCFunction)date_timetuple,    METH_NOARGS,
          PyDoc_STR("Return time tuple, compatible with time.localtime().")},
 
+	{"yday",   (PyCFunction)date_yday,    METH_NOARGS,
+         PyDoc_STR("Return the day of the year.")},
+
 	{"isocalendar", (PyCFunction)date_isocalendar,  METH_NOARGS,
 	 PyDoc_STR("Return a 3-tuple containing ISO year, week number, and "
 	 	   "weekday.")},