The upload date of Youtube videos isn't retrieved

[arisboch]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.08.27.1. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.08.27.1

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• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
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casval@casval-X6815 /tmp % youtube-dl -v -o  '%(uploader)s_%(upload_date)s_%(title)s_%(format)s_%(id)s.%(ext)s'  https://www.youtube.com/watch\?v\=bqaYCfXWyQo
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-o', u'%(uploader)s_%(upload_date)s_%(title)s_%(format)s_%(id)s.%(ext)s', u'https://www.youtube.com/watch?v=bqaYCfXWyQo']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.08.27.1
[debug] Python version 2.7.13 - Linux-4.10.0-33-generic-x86_64-with-Ubuntu-17.04-zesty
[debug] exe versions: avconv 3.2.4-1build2, avprobe 3.2.4-1build2, ffmpeg 3.2.4-1build2, ffprobe 3.2.4-1build2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] bqaYCfXWyQo: Downloading webpage
[youtube] bqaYCfXWyQo: Downloading video info webpage
[youtube] bqaYCfXWyQo: Extracting video information
WARNING: unable to extract uploader nickname
[youtube] bqaYCfXWyQo: Downloading MPD manifest
[debug] Default format spec: bestvideo+bestaudio/best
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on u'https://r12---sn-4g57knll.googlevideo.com/videoplayback?id=6ea69809f5d6c90a&itag=135&source=youtube&requiressl=yes&ei=9_KmWYayIdSJW6OuoXg&mv=m&ms=au&mm=31&mn=sn-4g57knll&pl=32&initcwndbps=1918750&ratebypass=yes&mime=video/mp4&gir=yes&clen=14144143&lmt=1476199058131924&dur=208.080&key=dg_yt0&signature=7614C33EB12DE4297015233FEFB2546CBB70D780.F16B7BB8AA2F39CFC093065E266644D71A6310&mt=1504113318&beids=[9466592]&ip=2a02:8070:4a6:f800:3503:5cac:5070:b5b3&ipbits=0&expire=1504134999&sparams=ip,ipbits,expire,id,itag,source,requiressl,ei,mv,ms,mm,mn,pl,initcwndbps,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_135 - 640x480 (DASH video)_bqaYCfXWyQo.f135.mp4
[download] 100% of 13.49MiB in 00:03
[debug] Invoking downloader on u'https://r12---sn-4g57knll.googlevideo.com/videoplayback?sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&requiressl=yes&clen=3443476&lmt=1435711213636640&initcwndbps=1918750&key=yt6&beids=%5B9466592%5D&ipbits=0&signature=D9A36993AD90661AE0DEBCF2C034E4491B0A2309.47BAA984F4443B0136BA6AE79BC5CD6F45DAF082&expire=1504134999&keepalive=yes&itag=251&mime=audio%2Fwebm&dur=208.121&ms=au&id=o-APSr4RRbo_Vc7AxkhUqsC67a9e8kYhKpbuDGcmXaBlWg&ei=9_KmWc4CxrRZzemukA4&mv=m&pl=32&mt=1504113318&gir=yes&ip=2a02%3A8070%3A4a6%3Af800%3A3503%3A5cac%3A5070%3Ab5b3&mn=sn-4g57knll&source=youtube&mm=31&ratebypass=yes'
[download] Destination: Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_251 - audio only (DASH audio)_bqaYCfXWyQo.f251.webm
[download] 100% of 3.28MiB in 00:00
[ffmpeg] Merging formats into "Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_135 - 640x480 (DASH video)+251 - audio only (DASH audio)_bqaYCfXWyQo.mkv"
[debug] ffmpeg command line: avconv -y -i 'file:Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_135 - 640x480 (DASH video)_bqaYCfXWyQo.f135.mp4' -i 'file:Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_251 - audio only (DASH audio)_bqaYCfXWyQo.f251.webm' -c copy -map '0:v:0' -map '1:a:0' 'file:Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_135 - 640x480 (DASH video)+251 - audio only (DASH audio)_bqaYCfXWyQo.temp.mkv'
Deleting original file Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_135 - 640x480 (DASH video)_bqaYCfXWyQo.f135.mp4 (pass -k to keep)
Deleting original file Cam Gersh_NA_DJ KRABS - Electric Zoo (Bee Boo Boo Bop)_251 - audio only (DASH audio)_bqaYCfXWyQo.f251.webm (pass -k to keep)

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The video is downloaded without problems, but the upload date of the video is claimed to be not available. This is not a new problem, btw, but it doesn't go away when simply trying again anymore.