--- _strptime.py.orig   2014-12-30 15:47:05.069835336 -0500
+++ _strptime.py        2014-12-30 15:47:21.509139500 -0500
@@ -441,7 +441,7 @@
     # Cannot pre-calculate datetime_date() since can change in Julian
     # calculation and thus could have different value for the day of the week
     # calculation.
-    if julian == -1:
+    if julian == -1 and week_of_year != 0:
         # Need to add 1 to result since first day of the year is 1, not 0.
         julian = datetime_date(year, month, day).toordinal() - \
                   datetime_date(year, 1, 1).toordinal() + 1