Load a heardledecades page and click the arrows at the top left panel, or enter a custom date, to go to that dates herdle.
IMPORTANT: MAKE SURE TO ENABLE Synchronous page mode IN VIOLENT MONKEY, OR THE TAMPERMONKEY EQUIVELENT Userscripts API Dynamic
Should work with all heardledecades sites, but if there's one I missed, just add a new @match line for it, as they (should) all use the same date method. There's probably some way to make this run a bit faster/more optimized, but this is my first script, so feel free to leave suggestions/improvements or completely remix.
Commercial use is prohibited. (Don't be a dick and try and sell a script. (I know this isn't a real worry, but just to be safe))
