Sadly a tool that was not developed (such a wasted opportunity by the management)
The DCs could reference a global attribute, “month” kept in a client information DC, this DC can have the shape of a key, a title block, a logo…then you would need one of Dan’s snippets
Redraw all dynamic components? - SketchUp / Dynamic Components - SketchUp Community
to update the drawing
Or you could create a personal ruby script to change the month attribute. You will probably need to consider some ruby code eventually to extend the power of DCs