diff --git a/_config/filters.js b/_config/filters.js
index 5de64dc..eaada91 100644
--- a/_config/filters.js
+++ b/_config/filters.js
@@ -18,9 +18,18 @@ export default function (eleventyConfig) {
 		return collection.slice(0, n);
 	});
 
+	eleventyConfig.addFilter("dateStringsEqual", (dateString1, dateString2) => {
+		const date1 = DateTime.fromISO(dateString1);
+		const date2 = DateTime.fromISO(dateString2);
+
+		if ((date1.hasSame(date2, "year") && date1.hasSame(date2, "month")) && date1.hasSame(date2, "day"))
+			return true;
+		else return false;
+	});
+
 	/* For <time> elements */
-	eleventyConfig.addFilter("htmlDateString", (dateObj) => {
-		return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy-LL-dd");
+	eleventyConfig.addFilter("htmlDateString", (dateString, zone) => {
+		return DateTime.fromISO(dateString, { zone: zone || "utc" }).toFormat("yyyy-LL-dd");
 	});
 
 	/* What it says on the tin */
@@ -41,8 +50,8 @@ export default function (eleventyConfig) {
 	});
 
 	/* Human-readable dates */
-	eleventyConfig.addFilter("readableDate", (dateObj, zone) => {
-		return DateTime.fromJSDate(dateObj, { zone: zone || "utc" }).toLocaleString(
+	eleventyConfig.addFilter("readableDate", (dateString, zone) => {
+		return DateTime.fromISO(dateString, { zone: zone || "utc" }).toLocaleString(
 			DateTime.DATE_FULL,
 		);
 	});
diff --git a/_includes/layouts/post.njk b/_includes/layouts/post.njk
index 3dcd5a2..dc57e86 100644
--- a/_includes/layouts/post.njk
+++ b/_includes/layouts/post.njk
@@ -4,8 +4,11 @@ layout: page.njk
 
 <p>Written by {{ author }}</p>
 
-<p>Posted on <time datetime="{{ datePosted }}">{{ date-posted | htmlDateString }}</time></p>
-<p>Updated on <time datetime="{{ date-updated }}">{{ date-updated | htmlDateString }}</time></p>
+<p>Posted on <time datetime="{{ datePosted | htmlDateString }}">{{ datePosted | readableDate }}</time></p>
+
+{% if not datePosted | dateStringsEqual(dateUpdated) %}
+  <p>Updated on <time datetime="{{ dateUpdated | htmlDateString }}">{{ dateUpdated | readableDate }}</time></p>
+{% endif %}
 
 <img src="{{ image.src }}" alt="{{ image.alt }}">
 
diff --git a/src/posts/test-post.md b/src/posts/test-post.md
index 7eaf2f8..c56859c 100644
--- a/src/posts/test-post.md
+++ b/src/posts/test-post.md
@@ -6,8 +6,6 @@ image:
   alt: a chickadee on a fence post
   title: null
 ___mb_schema: /.mattrbld/schemas/post.json
-date-posted: '2026-09-24'
-date-updated: '2026-09-24'
 datePosted: '2026-09-24T10:30:00-07:00'
 dateUpdated: '2026-09-24T10:34:51-07:00'
 ---