Add current build date to output

_includes/layouts/base.njk

@@ -56,6 +56,6 @@
 
 		<footer></footer>
 
-		<!-- Current page: {{ page.url | htmlBaseUrl }} -->
+		<!-- This page `{{ page.url | htmlBaseUrl }}` was built on {% currentBuildDate %} -->
 	</body>
 </html>

eleventy.config.js

@@ -92,6 +92,10 @@ module.exports = function(eleventyConfig) {
 		});
 	});
 
+	eleventyConfig.addShortcode("currentBuildDate", () => {
+		return (new Date()).toISOString();
+	})
+
 	// Features to make your build faster (when you need them)
 
 	// If your passthrough copy gets heavy and cumbersome, add this line