diff --git a/_config/filters.js b/_config/filters.js
index 5a48517..24125ae 100644
--- a/_config/filters.js
+++ b/_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
diff --git a/package-lock.json b/package-lock.json
index 4bae92a..5fa386b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,8 @@
         "@11ty/eleventy": "^3.1.5",
         "@11ty/eleventy-img": "^6.0.4",
         "@11ty/eleventy-navigation": "^1.0.5",
-        "@mdit/plugin-attrs": "^0.25.1"
+        "@mdit/plugin-attrs": "^0.25.1",
+        "luxon": "^3.7.2"
       }
     },
     "node_modules/@11ty/dependency-tree": {
diff --git a/package.json b/package.json
index 470109e..c53b244 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
     "@11ty/eleventy": "^3.1.5",
     "@11ty/eleventy-img": "^6.0.4",
     "@11ty/eleventy-navigation": "^1.0.5",
-    "@mdit/plugin-attrs": "^0.25.1"
+    "@mdit/plugin-attrs": "^0.25.1",
+    "luxon": "^3.7.2"
   }
 }