CabinJS/grunt-pages — pull request #52 by danburzo (2013-10-08 13:21:12+00:00)
Title: Use the post's last modified date if no date is provided in the metadata

Currently, if a post's metadata does not contain the `date` property, it will default to Jan 1, 1970.
I believe it's useful to use the file's last modified date instead.