htmlDateString

_config/filters.js

@@ -1,5 +1,6 @@
-export default function (eleventyConfig) {
+import { DateTime } from "luxon";
 
+export default function (eleventyConfig) {
 	/* Create a single alt string from a multi-string alt object */
 	eleventyConfig.addFilter("createAlt", (altObject) => {
 		let alt;
@@ -12,6 +13,11 @@ export default function (eleventyConfig) {
 		return alt;
 	});
 
+	/* For <time> elements */
+	eleventyConfig.addFilter("htmlDateString", (dateObj) => {
+		return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy-LL-dd");
+	});
+
 	/* What it says on the tin */
 	eleventyConfig.addFilter("randomize", function(array) {
 		// Create a copy of the array to avoid modifying the original