{"action":"created","comment":{"url":"https://api.github.com/repos/pydata/pandas/pulls/comments/41430284","id":41430284,"diff_hunk":"@@ -148,6 +149,14 @@ def test_dst(self):\n         self.assertTrue(is_datetimetz(s2))\n         self.assertEqual(s1.dtype, s2.dtype)\n \n+    def test_parser(self):\n+        for tz, constructor in product(('UTC', 'US/Eastern'),\n+                                       ('M8', 'datetime64')):","path":"pandas/tests/test_dtypes.py","position":12,"original_position":12,"commit_id":"1decd2e35a5854e045032cef00047ea6504d3b7a","original_commit_id":"1decd2e35a5854e045032cef00047ea6504d3b7a","user":{"login":"jreback","id":953992,"avatar_url":"https://avatars.githubusercontent.com/u/953992?v=3","gravatar_id":"","url":"https://api.github.com/users/jreback","html_url":"https://github.com/jreback","followers_url":"https://api.github.com/users/jreback/followers","following_url":"https://api.github.com/users/jreback/following{/other_user}","gists_url":"https://api.github.com/users/jreback/gists{/gist_id}","starred_url":"https://api.github.com/users/jreback/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jreback/subscriptions","organizations_url":"https://api.github.com/users/jreback/orgs","repos_url":"https://api.github.com/users/jreback/repos","events_url":"https://api.github.com/users/jreback/events{/privacy}","received_events_url":"https://api.github.com/users/jreback/received_events","type":"User","site_admin":false},"body":"gr8 thanks!","created_at":"2015-10-07T18:52:20Z","updated_at":"2015-10-07T18:52:20Z","html_url":"https://github.com/pydata/pandas/pull/11245#discussion_r41430284","pull_request_url":"https://api.github.com/repos/pydata/pandas/pulls/11245","_links":{"self":{"href":"https://api.github.com/repos/pydata/pandas/pulls/comments/41430284"},"html":{"href":"https://github.com/pydata/pandas/pull/11245#discussion_r41430284"},"pull_request":{"href":"https://api.github.com/repos/pydata/pandas/pulls/11245"}}},"pull_request":{"url":"https://api.github.com/repos/pydata/pandas/pulls/11245","id":46817143,"html_url":"https://github.com/pydata/pandas/pull/11245","diff_url":"https://github.com/pydata/pandas/pull/11245.diff","patch_url":"https://github.com/pydata/pandas/pull/11245.patch","issue_url":"https://api.github.com/repos/pydata/pandas/issues/11245","number":11245,"state":"open","locked":false,"title":"BUG: datetime64 series reduces to nan when empty instead of nat","user":{"login":"llllllllll","id":3064397,"avatar_url":"https://avatars.githubusercontent.com/u/3064397?v=3","gravatar_id":"","url":"https://api.github.com/users/llllllllll","html_url":"https://github.com/llllllllll","followers_url":"https://api.github.com/users/llllllllll/followers","following_url":"https://api.github.com/users/llllllllll/following{/other_user}","gists_url":"https://api.github.com/users/llllllllll/gists{/gist_id}","starred_url":"https://api.github.com/users/llllllllll/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/llllllllll/subscriptions","organizations_url":"https://api.github.com/users/llllllllll/orgs","repos_url":"https://api.github.com/users/llllllllll/repos","events_url":"https://api.github.com/users/llllllllll/events{/privacy}","received_events_url":"https://api.github.com/users/llllllllll/received_events","type":"User","site_admin":false},"body":"I ran into some strange behavior with a series of dtype datetime64[ns] where I called max and got back a `nan`. I think the correct behavior here is to return `nat`. I looked through test_nanops but I am not sure where the correct place to put the test for this is.\r\n\r\nThe new behavior is:\r\n\r\n```python\r\nIn [1]: pd.Series(dtype='datetime64[ns]').max()\r\nOut[1]: NaT\r\n```\r\nwhere the old behavior was:\r\n```python\r\nIn [1]: pd.Series(dtype='datetime64[ns]').max()\r\nOut[1]: nan\r\n```","created_at":"2015-10-05T18:41:09Z","updated_at":"2015-10-07T18:52:20Z","closed_at":null,"merged_at":null,"merge_commit_sha":"4020f9c42f200278d08f8d02a7dc6e6c37635d82","assignee":null,"milestone":{"url":"https://api.github.com/repos/pydata/pandas/milestones/37","html_url":"https://github.com/pydata/pandas/milestones/0.17.1","labels_url":"https://api.github.com/repos/pydata/pandas/milestones/37/labels","id":1299459,"number":37,"title":"0.17.1","description":"after 0.17.0 of 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