Reworked 'upload_date' code for output sequence in YoutubeIE.

Reverted to previous version of 'upload_date' and fixed
a mistake that prevented the code from working properly.

youtube-dl

@@ -5,6 +5,7 @@
 # Author: Benjamin Johnson
 # License: Public domain code
 import cookielib
+import datetime
 import htmlentitydefs
 import httplib
 import locale
@@ -36,21 +37,6 @@ std_headers = {
 
 simple_title_chars = string.ascii_letters.decode('ascii') + string.digits.decode('ascii')
 
-month_name_to_number = {
-	'January':	'01',
-	'February':	'02',
-	'March':	'03',
-	'April':	'04',
-	'May':		'05',
-	'June':		'06',
-	'July':		'07',
-	'August':	'08',
-	'September':	'09',
-	'October':	'10',
-	'November':	'11',
-	'December':	'12',
-}
-
 def preferredencoding():
 	"""Get preferred encoding.
 
@@ -913,18 +899,13 @@ class YoutubeIE(InfoExtractor):
 		upload_date = u'NA'
 		mobj = re.search(r'id="eow-date".*?>(.*?)</span>', video_webpage, re.DOTALL)
 		if mobj is not None:
+			upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
+			format_expressions = ['%d %B %Y', '%B %d %Y']
+			for expression in format_expressions:
 				try:
-				if ',' in mobj.group(1):
-					# Month Day, Year
-					m, d, y = mobj.group(1).replace(',', '').split()
-				else:
-					# Day Month Year, we'll suppose
-					d, m, y = mobj.group(1).split()
-				m = month_name_to_number[m]
-				d = '%02d' % (long(d))
-				upload_date = '%s%s%s' % (y, m, d)
+					upload_date = datetime.datetime.strptime(upload_date, expression).strftime('%Y%m%d')
 				except:
-				upload_date = u'NA'
+					pass
 
 		# description
 		video_description = 'No description available.'