Allow me to tell how is this different from what Bullet already has. What I am suggesting is the ability to view a specific "list" in a calendar view. Right now, while we can organize our entries under a specific list in chronological order, they are not as intuitive to get a feel of how regular I have been writing entries about the topic.
It is very similar to what DayOne Journal's interface offers. It has nice little calendar, and clicking on the date allows us to see all the entries I wrote on the said date. While I love using Bullet for all tasks and notes for organizing, I still use DayOne for reflection/ Journaling simply because it allows me to see my reflections in that format.
The feature could be based within the **View** option of the specific list, or it could be a standalone Calendar view, wherein we have an option to select all the lists whose entries we want to see in this Calendar view.
Thanks in advance if you consider implementing π. Would love to give more feedback if developers think this as worth the shot :)
PS: I have attached a screen shot of what DayOne interface looks like, so that others could make a better call on the feature request!