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OK, so yes I figured out I was missing some files: Luxon 1.0, and the Luxon adapter (chartjs-adapter-luxon), available on GitHub (https://github.com/chartjs/chartjs-adapter-luxon). I struggle with GitHub sometimes, plus I didn’t want to link to any non-local files. I managed to find and view each file in a browser window, and then just saved each page’s source as a plain text doc, which I named appropriately. Stashed those in the same local directory as my chart’s HTML page and then linked each file to my chart’s page in its HTML. My chart sprang to life and all is well. I take it there’s a better way to get a file off of GitHub, but I couldn’t figure that out. Apologies for the knumbskullery, but it worked…
Source:stackexchange.com