Wong post_url reuslt

[teddychan]

for the setting:

"post_url": "/{year}/{month}/{title}",

I created a posts: 2013-05-16_the-post-title

Suppose I should get the URL
/2013/05/the-post-title

However, when I run punch g
I got:

Created /2013/05/16_the-post-title

Here is the setting in config.json

"blog": {
        "posts_dir": "posts",
        "post_format": "markdown",
        "post_url": "/{year}/{month}/{title}",
        "teaser_length": 2,
        "homepage_posts": 5,

        "archive_urls": {
            "all": "/archive",
            "year": "/{year}",
            "year_month": "/{year}/{month}",
            "year_month_date": "/{year}/{month}/{date}",
            "tag": "/tag/{tag}"
        }
    },