added to_date adaptor to format a date suitable for DateField

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%40926

scrapy/trunk/scrapy/contrib_exp/adaptors/__init__.py

@@ -1,4 +1,5 @@
 from scrapy.contrib_exp.adaptors.extraction import extract, ExtractImageLinks
 from scrapy.contrib_exp.adaptors.markup import remove_tags, remove_root, unquote
 from scrapy.contrib_exp.adaptors.misc import to_unicode, clean_spaces, strip, drop_empty, delist, Regex
+from scrapy.contrib_exp.adaptors.date import to_date
 

scrapy/trunk/scrapy/contrib_exp/adaptors/date.py

@@ -0,0 +1,14 @@
+import time
+
+def to_date(format):
+    """
+    Converts a date string to a YYYY-MM-DD one suitable for DateField
+
+    format is the format string passed to time.strptime
+    
+    Input: string/unicode
+    Output: string
+    """
+    def _to_date(value):
+        return time.strftime('%Y-%m-%d', time.strptime(value, format))
+    return _to_date