You can specify the permalinks for your site in _config.yml or in the front-matter for each post.
Variables
Besides the following variables, you can use any attributes in the permalink except :path and :permalink.
| Variable | 
Description | 
:year | 
Published year of posts (4-digit) | 
:month | 
Published month of posts (2-digit) | 
:i_month | 
Published month of posts (Without leading zeros) | 
:day | 
Published day of posts (2-digit) | 
:i_day | 
Published day of posts (Without leading zeros) | 
:hour | 
Published hour of posts (2-digit) | 
:minute | 
Published minute of posts (2-digit) | 
:second | 
Published second of posts (2-digit) | 
:timestamp | 
Timestamp of post’s published date | 
:title | 
Filename (relative to “source/_posts/“ folder) | 
:name | 
Filename | 
:post_title | 
Post title | 
:id | 
Post ID (not persistent across cache reset) | 
:category | 
Categories. If the post is uncategorized, it will use the default_category value. | 
:hash | 
SHA1 hash of filename (same as :title) and date (12-hexadecimal) | 
You can define the default value of each variable in the permalink through the permalink_defaults setting:
permalink_defaults:   lang: en
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Examples
source/_posts/hello-world.mdtitle: Hello World date: 2013-07-14 17:01:34 categories:   - foo   - bar
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| Setting | 
Result | 
:year/:month/:day/:title/ | 
2013/07/14/hello-world/ | 
:year-:month-:day-:title.html | 
2013-07-14-hello-world.html | 
:category/:title/ | 
foo/bar/hello-world/ | 
:title-:hash/ | 
hello-world-a2c8ac003b43/ | 
source/_posts/lorem/hello-world.mdtitle: Hello World date: 2013-07-14 17:01:34 categories:   - foo   - bar
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| Setting | 
Result | 
:year/:month/:day/:title/ | 
2013/07/14/lorem/hello-world/ | 
:year/:month/:day/:name/ | 
2013/07/14/hello-world/ | 
Multi-language Support
To create a multi-language site, you can modify the new_post_name and permalink settings like this:
new_post_name: :lang/:title.md permalink: :lang/:title/
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When you create a new post, the post will be saved to:
$ hexo new "Hello World" --lang tw
 
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and the URL will be:
http://localhost:4000/tw/hello-world/
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