diff -r 0e56d79fa2ab Lib/_strptime.py
--- a/Lib/_strptime.py	Tue May 24 18:29:46 2011 +0200
+++ b/Lib/_strptime.py	Wed May 25 14:23:15 2011 -0500
@@ -201,6 +201,8 @@
             'S': r"(?P<S>6[0-1]|[0-5]\d|\d)",
             'U': r"(?P<U>5[0-3]|[0-4]\d|\d)",
             'w': r"(?P<w>[0-6])",
+            'u': r"(?P<u>[1-7])",
+            'V': r"(?P<V>5[0-3]|0[1-9]|[1-4]\d|\d)",
             # W is set below by using 'U'
             'y': r"(?P<y>\d\d)",
             #XXX: Does 'Y' need to worry about having less or more than
@@ -294,6 +296,22 @@
         days_to_week = week_0_length + (7 * (week_of_year - 1))
         return 1 + days_to_week + day_of_week
 
+def _calc_julian_from_V(year, iso_week, iso_weekday):
+    """Calculate the Julian day based on the ISO 8601 year, week, and weekday.
+    ISO weeks start on Mondays, with week 01 being the week containing 4 Jan.
+    ISO week days range from 1 (Monday) to 7 (Sunday).
+
+    """
+    correction = datetime_date(year,1,4).isoweekday() + 3
+    ordinal = (iso_week * 7) + iso_weekday - correction
+    print(ordinal)
+    # ordinal may be negative or 0 now, which means the date is in the previous
+    # calendar year
+    if ordinal < 1:
+        ordinal += dateteime_date(year,1,1).toordinal() - datetime_date(year-1,1,1)
+        return year - 1, ordinal
+    else:
+        return year, ordinal
 
 def _strptime(data_string, format="%a %b %d %H:%M:%S %Y"):
     """Return a 2-tuple consisting of a time struct and an int containing
@@ -348,6 +366,8 @@
     # though
     week_of_year = -1
     week_of_year_start = -1
+    iso_weekday = -1
+    iso_weekday = -1
     # weekday and julian defaulted to -1 so as to signal need to calculate
     # values
     weekday = julian = -1
@@ -414,6 +434,14 @@
                 weekday = 6
             else:
                 weekday -= 1
+            iso_weekday = weekday + 1
+        elif group_key == 'u':
+            iso_weekday = int(found_dict['u'])
+            weekday = iso_weekday % 7
+            if weekday == 0:
+                weekday = 6
+            else:
+                weekday -=1
         elif group_key == 'j':
             julian = int(found_dict['j'])
         elif group_key in ('U', 'W'):
@@ -424,6 +452,8 @@
             else:
                 # W starts week on Monday.
                 week_of_year_start = 0
+        elif group_key == 'V':
+            iso_week = int(found_dict['V'])
         elif group_key == 'z':
             z = found_dict['z']
             tzoffset = int(z[1:3]) * 60 + int(z[3:5])
@@ -450,6 +480,8 @@
         week_starts_Mon = True if week_of_year_start == 0 else False
         julian = _calc_julian_from_U_or_W(year, week_of_year, weekday,
                                             week_starts_Mon)
+    elif julian == -1 and iso_week != -1 and iso_weekday != -1:
+        year, julian = _calc_julian_from_V(year, iso_week, iso_weekday)
     # Cannot pre-calculate datetime_date() since can change in Julian
     # calculation and thus could have different value for the day of the week
     # calculation.