error while building

[ghost]

While I build the site I got the following message,

Started building sites ...
ERROR 2017/07/01 22:22:41 Failed to parse date '1637' in page publication/fermats-last-theorem.md
Built site for language en:
0 draft content
0 future content
0 expired content
7 regular pages created
26 other pages created
0 non-page files copied
10 paginator pages created
6 tags created
2 categories created
total in 44 ms
Watching for changes in /home/sbmaruf/Documents/my_web/{data,content,layouts,static,themes}
Serving pages from memory
Web Server is available at http://localhost:1313/lambdafu/hugo-finite/ (bind address 127.0.0.1)
Press Ctrl+C to stop

Why this error occured,

ERROR 2017/07/01 22:22:41 Failed to parse date '1637' in page publication/fermats-last-theorem.md

And also can I integrate "DisQUS Comment" with this site?

My site is at "https://github.com/sbmaruf/sbmaruf.github.io" and the content is at "https://github.com/sbmaruf/website".

Another thing, the 'RSS Feed' option is not working'.