A way to built an stacked-grouped bar graph

Good morning.

I want to build a bar graph, trying to combine stack and group barmdoes. I think that isn’t a way to do this directly, but maybe an easier way to do is using with of bars and x-offset.

My problem is that my x axis has ‘%d-%m-%Y’ tick format, so I don’t know how to use width property of bars, because neither small nor big int or floats numbers works.

Thanks you very much in advance!!