I love the period addition. I would like to suggest another option : having it by day and not by week. I imagine a usecase for project management. One could use your plugin to tell the tale of a trip day by day or of an important project? That person would not list all of the day of a life, but from the starting date of the project and the end. I would use that if you could add the option of having square being a day.
But it's just a suggeston. I love your plugin 
Thanks again for the work!