Create live wallpaper slideshow that changes based on date rather than duration

I'm trying to create a live wallpaper slideshow that will display a specific image for every day of the year. Effectively a live desktop calendar.

I've seen the question How do I create a desktop wallpaper slideshow? , but I want to ask something more specific: How can I specify displaying a specific image on a specific date? For instance, is there an "isdate" boolean operator I can use here? Or Is there some way I could hack the <starttime> section to make it display a specific image by date? Or is there a better way to do this?

Solution 1:

You can try using conky. If the tool can create a calendar or clock on desktop maybe it can also change the background?