{"action":"created","comment":{"url":"https://api.github.com/repos/pydata/pandas/pulls/comments/39919608","id":39919608,"diff_hunk":"@@ -86,20 +86,21 @@ def _guess_datetime_format(dt_str, dayfirst=False,\n     if not isinstance(dt_str, compat.string_types):\n         return None\n \n-    day_attribute_and_format = (('day',), '%d')\n+    day_attribute_and_format = (('day',), '%d', 2)\n \n+    # attr name, format, padding (if any)\n     datetime_attrs_to_format = [\n-        (('year', 'month', 'day'), '%Y%m%d'),\n-        (('year',), '%Y'),\n-        (('month',), '%B'),\n-        (('month',), '%b'),\n-        (('month',), '%m'),\n+        (('year', 'month', 'day'), '%Y%m%d', 0),\n+        (('year',), '%Y', 4),","path":"pandas/tseries/tools.py","position":15,"original_position":15,"commit_id":"6bd2e761a96294b431b782b054957ee8151d010e","original_commit_id":"6bd2e761a96294b431b782b054957ee8151d010e","user":{"login":"sinhrks","id":1696302,"avatar_url":"https://avatars.githubusercontent.com/u/1696302?v=3","gravatar_id":"","url":"https://api.github.com/users/sinhrks","html_url":"https://github.com/sinhrks","followers_url":"https://api.github.com/users/sinhrks/followers","following_url":"https://api.github.com/users/sinhrks/following{/other_user}","gists_url":"https://api.github.com/users/sinhrks/gists{/gist_id}","starred_url":"https://api.github.com/users/sinhrks/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sinhrks/subscriptions","organizations_url":"https://api.github.com/users/sinhrks/orgs","repos_url":"https://api.github.com/users/sinhrks/repos","events_url":"https://api.github.com/users/sinhrks/events{/privacy}","received_events_url":"https://api.github.com/users/sinhrks/received_events","type":"User","site_admin":false},"body":"Ah, what I meant is to keep ``%Y`` without padding, without adding `%y` as this is ambiguous. ","created_at":"2015-09-19T13:28:18Z","updated_at":"2015-09-19T13:28:18Z","html_url":"https://github.com/pydata/pandas/pull/11146#discussion_r39919608","pull_request_url":"https://api.github.com/repos/pydata/pandas/pulls/11146","_links":{"self":{"href":"https://api.github.com/repos/pydata/pandas/pulls/comments/39919608"},"html":{"href":"https://github.com/pydata/pandas/pull/11146#discussion_r39919608"},"pull_request":{"href":"https://api.github.com/repos/pydata/pandas/pulls/11146"}}},"pull_request":{"url":"https://api.github.com/repos/pydata/pandas/pulls/11146","id":45461011,"html_url":"https://github.com/pydata/pandas/pull/11146","diff_url":"https://github.com/pydata/pandas/pull/11146.diff","patch_url":"https://github.com/pydata/pandas/pull/11146.patch","issue_url":"https://api.github.com/repos/pydata/pandas/issues/11146","number":11146,"state":"open","locked":false,"title":"PERF: infer_datetime_format without padding 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