We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
[https://www.franceinter.fr] WARNING: unable to extract upload date
---

### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.12.14*. If it's not, read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.
- [x] I've **verified** and **I assure** that I'm running youtube-dl **2017.12.14**

### Before submitting an *issue* make sure you have:
- [x] At least skimmed through the [README](https://github.com/rg3/youtube-dl/blob/master/README.md), **most notably** the [FAQ](https://github.com/rg3/youtube-dl#faq) and [BUGS](https://github.com/rg3/youtube-dl#bugs) sections
- [x] [Searched](https://github.com/rg3/youtube-dl/search?type=Issues) the bugtracker for similar issues including closed ones

### What is the purpose of your *issue*?
- [ ] Bug report (encountered problems with youtube-dl)
- [x] Site support request (request for adding support for a new site)
- [ ] Feature request (request for a new functionality)
- [ ] Question
- [ ] Other

---

``` 
youtube-dl-mp3 "https://www.franceinter.fr/emissions/les-concerts-d-inter/les-concerts-d-inter-14-decembre-2017"
[FranceInter] les-concerts-d-inter/les-concerts-d-inter-14-decembre-2017: Downloading webpage
WARNING: unable to extract upload date; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
```

```
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.14
[debug] Python version 2.7.12 - Linux-4.4.0-103-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: avconv 2.8.11-0ubuntu0.16.04.1, avprobe 2.8.11-0ubuntu0.16.04.1, ffmpeg 2.8.11-0ubuntu0.16.04.1, ffprobe 2.8.11-0ubuntu0.16.04.1
[debug] Proxy map: {}
```

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `youtube_dl/extractor/franceinter.py`
Content:
```
1 # coding: utf-8
2 from __future__ import unicode_literals
3 
4 from .common import InfoExtractor
5 from ..utils import month_by_name
6 
7 
8 class FranceInterIE(InfoExtractor):
9     _VALID_URL = r'https?://(?:www\.)?franceinter\.fr/emissions/(?P<id>[^?#]+)'
10 
11     _TEST = {
12         'url': 'https://www.franceinter.fr/emissions/affaires-sensibles/affaires-sensibles-07-septembre-2016',
13         'md5': '9e54d7bdb6fdc02a841007f8a975c094',
14         'info_dict': {
15             'id': 'affaires-sensibles/affaires-sensibles-07-septembre-2016',
16             'ext': 'mp3',
17             'title': 'Affaire Cahuzac : le contentieux du compte en Suisse',
18             'description': 'md5:401969c5d318c061f86bda1fa359292b',
19             'upload_date': '20160907',
20         },
21     }
22 
23     def _real_extract(self, url):
24         video_id = self._match_id(url)
25 
26         webpage = self._download_webpage(url, video_id)
27 
28         video_url = self._search_regex(
29             r'(?s)<div[^>]+class=["\']page-diffusion["\'][^>]*>.*?<button[^>]+data-url=(["\'])(?P<url>(?:(?!\1).)+)\1',
30             webpage, 'video url', group='url')
31 
32         title = self._og_search_title(webpage)
33         description = self._og_search_description(webpage)
34 
35         upload_date_str = self._search_regex(
36             r'class=["\']cover-emission-period["\'][^>]*>[^<]+\s+(\d{1,2}\s+[^\s]+\s+\d{4})<',
37             webpage, 'upload date', fatal=False)
38         if upload_date_str:
39             upload_date_list = upload_date_str.split()
40             upload_date_list.reverse()
41             upload_date_list[1] = '%02d' % (month_by_name(upload_date_list[1], lang='fr') or 0)
42             upload_date_list[2] = '%02d' % int(upload_date_list[2])
43             upload_date = ''.join(upload_date_list)
44         else:
45             upload_date = None
46 
47         return {
48             'id': video_id,
49             'title': title,
50             'description': description,
51             'upload_date': upload_date,
52             'formats': [{
53                 'url': video_url,
54                 'vcodec': 'none',
55             }],
56         }
57
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/youtube_dl/extractor/franceinter.py b/youtube_dl/extractor/franceinter.py
--- a/youtube_dl/extractor/franceinter.py
+++ b/youtube_dl/extractor/franceinter.py
@@ -33,7 +33,7 @@
         description = self._og_search_description(webpage)
 
         upload_date_str = self._search_regex(
-            r'class=["\']cover-emission-period["\'][^>]*>[^<]+\s+(\d{1,2}\s+[^\s]+\s+\d{4})<',
+            r'class=["\']\s*cover-emission-period\s*["\'][^>]*>[^<]+\s+(\d{1,2}\s+[^\s]+\s+\d{4})<',
             webpage, 'upload date', fatal=False)
         if upload_date_str:
             upload_date_list = upload_date_str.split()

{"golden_diff": "diff --git a/youtube_dl/extractor/franceinter.py b/youtube_dl/extractor/franceinter.py\n--- a/youtube_dl/extractor/franceinter.py\n+++ b/youtube_dl/extractor/franceinter.py\n@@ -33,7 +33,7 @@\n         description = self._og_search_description(webpage)\n \n         upload_date_str = self._search_regex(\n-            r'class=[\"\\']cover-emission-period[\"\\'][^>]*>[^<]+\\s+(\\d{1,2}\\s+[^\\s]+\\s+\\d{4})<',\n+            r'class=[\"\\']\\s*cover-emission-period\\s*[\"\\'][^>]*>[^<]+\\s+(\\d{1,2}\\s+[^\\s]+\\s+\\d{4})<',\n             webpage, 'upload date', fatal=False)\n         if upload_date_str:\n             upload_date_list = upload_date_str.split()\n", "issue": "[https://www.franceinter.fr] WARNING: unable to extract upload date\n---\r\n\r\n### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.12.14*. If it's not, read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.\r\n- [x] I've **verified** and **I assure** that I'm running youtube-dl **2017.12.14**\r\n\r\n### Before submitting an *issue* make sure you have:\r\n- [x] At least skimmed through the [README](https://github.com/rg3/youtube-dl/blob/master/README.md), **most notably** the [FAQ](https://github.com/rg3/youtube-dl#faq) and [BUGS](https://github.com/rg3/youtube-dl#bugs) sections\r\n- [x] [Searched](https://github.com/rg3/youtube-dl/search?type=Issues) the bugtracker for similar issues including closed ones\r\n\r\n### What is the purpose of your *issue*?\r\n- [ ] Bug report (encountered problems with youtube-dl)\r\n- [x] Site support request (request for adding support for a new site)\r\n- [ ] Feature request (request for a new functionality)\r\n- [ ] Question\r\n- [ ] Other\r\n\r\n---\r\n\r\n``` \r\nyoutube-dl-mp3 \"https://www.franceinter.fr/emissions/les-concerts-d-inter/les-concerts-d-inter-14-decembre-2017\"\r\n[FranceInter] les-concerts-d-inter/les-concerts-d-inter-14-decembre-2017: Downloading webpage\r\nWARNING: unable to extract upload date; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.\r\n```\r\n\r\n```\r\n[debug] System config: []\r\n[debug] User config: []\r\n[debug] Custom config: []\r\n[debug] Command-line args: [u'-v']\r\n[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8\r\n[debug] youtube-dl version 2017.12.14\r\n[debug] Python version 2.7.12 - Linux-4.4.0-103-generic-x86_64-with-Ubuntu-16.04-xenial\r\n[debug] exe versions: avconv 2.8.11-0ubuntu0.16.04.1, avprobe 2.8.11-0ubuntu0.16.04.1, ffmpeg 2.8.11-0ubuntu0.16.04.1, ffprobe 2.8.11-0ubuntu0.16.04.1\r\n[debug] Proxy map: {}\r\n```\n", "before_files": [{"content": "# coding: utf-8\nfrom __future__ import unicode_literals\n\nfrom .common import InfoExtractor\nfrom ..utils import month_by_name\n\n\nclass FranceInterIE(InfoExtractor):\n    _VALID_URL = r'https?://(?:www\\.)?franceinter\\.fr/emissions/(?P<id>[^?#]+)'\n\n    _TEST = {\n        'url': 'https://www.franceinter.fr/emissions/affaires-sensibles/affaires-sensibles-07-septembre-2016',\n        'md5': '9e54d7bdb6fdc02a841007f8a975c094',\n        'info_dict': {\n            'id': 'affaires-sensibles/affaires-sensibles-07-septembre-2016',\n            'ext': 'mp3',\n            'title': 'Affaire Cahuzac : le contentieux du compte en Suisse',\n            'description': 'md5:401969c5d318c061f86bda1fa359292b',\n            'upload_date': '20160907',\n        },\n    }\n\n    def _real_extract(self, url):\n        video_id = self._match_id(url)\n\n        webpage = self._download_webpage(url, video_id)\n\n        video_url = self._search_regex(\n            r'(?s)<div[^>]+class=[\"\\']page-diffusion[\"\\'][^>]*>.*?<button[^>]+data-url=([\"\\'])(?P<url>(?:(?!\\1).)+)\\1',\n            webpage, 'video url', group='url')\n\n        title = self._og_search_title(webpage)\n        description = self._og_search_description(webpage)\n\n        upload_date_str = self._search_regex(\n            r'class=[\"\\']cover-emission-period[\"\\'][^>]*>[^<]+\\s+(\\d{1,2}\\s+[^\\s]+\\s+\\d{4})<',\n            webpage, 'upload date', fatal=False)\n        if upload_date_str:\n            upload_date_list = upload_date_str.split()\n            upload_date_list.reverse()\n            upload_date_list[1] = '%02d' % (month_by_name(upload_date_list[1], lang='fr') or 0)\n            upload_date_list[2] = '%02d' % int(upload_date_list[2])\n            upload_date = ''.join(upload_date_list)\n        else:\n            upload_date = None\n\n        return {\n            'id': video_id,\n            'title': title,\n            'description': description,\n            'upload_date': upload_date,\n            'formats': [{\n                'url': video_url,\n                'vcodec': 'none',\n            }],\n        }\n", "path": "youtube_dl/extractor/franceinter.py"}], "after_files": [{"content": "# coding: utf-8\nfrom __future__ import unicode_literals\n\nfrom .common import InfoExtractor\nfrom ..utils import month_by_name\n\n\nclass FranceInterIE(InfoExtractor):\n    _VALID_URL = r'https?://(?:www\\.)?franceinter\\.fr/emissions/(?P<id>[^?#]+)'\n\n    _TEST = {\n        'url': 'https://www.franceinter.fr/emissions/affaires-sensibles/affaires-sensibles-07-septembre-2016',\n        'md5': '9e54d7bdb6fdc02a841007f8a975c094',\n        'info_dict': {\n            'id': 'affaires-sensibles/affaires-sensibles-07-septembre-2016',\n            'ext': 'mp3',\n            'title': 'Affaire Cahuzac : le contentieux du compte en Suisse',\n            'description': 'md5:401969c5d318c061f86bda1fa359292b',\n            'upload_date': '20160907',\n        },\n    }\n\n    def _real_extract(self, url):\n        video_id = self._match_id(url)\n\n        webpage = self._download_webpage(url, video_id)\n\n        video_url = self._search_regex(\n            r'(?s)<div[^>]+class=[\"\\']page-diffusion[\"\\'][^>]*>.*?<button[^>]+data-url=([\"\\'])(?P<url>(?:(?!\\1).)+)\\1',\n            webpage, 'video url', group='url')\n\n        title = self._og_search_title(webpage)\n        description = self._og_search_description(webpage)\n\n        upload_date_str = self._search_regex(\n            r'class=[\"\\']\\s*cover-emission-period\\s*[\"\\'][^>]*>[^<]+\\s+(\\d{1,2}\\s+[^\\s]+\\s+\\d{4})<',\n            webpage, 'upload date', fatal=False)\n        if upload_date_str:\n            upload_date_list = upload_date_str.split()\n            upload_date_list.reverse()\n            upload_date_list[1] = '%02d' % (month_by_name(upload_date_list[1], lang='fr') or 0)\n            upload_date_list[2] = '%02d' % int(upload_date_list[2])\n            upload_date = ''.join(upload_date_list)\n        else:\n            upload_date = None\n\n        return {\n            'id': video_id,\n            'title': title,\n            'description': description,\n            'upload_date': upload_date,\n            'formats': [{\n                'url': video_url,\n                'vcodec': 'none',\n            }],\n        }\n", "path": "youtube_dl/extractor/franceinter.py"}]}