Refactored latest posts and with a correct sort. Uses dates on posts rather than file creation dates (unreliable).

.eleventy.js

@@ -9,11 +9,15 @@ module.exports = function(eleventyConfig) {
   eleventyConfig.addLayoutAlias("post", "layouts/post.njk");
 
   eleventyConfig.addFilter("readableDate", dateObj => {
-    return DateTime.fromJSDate(dateObj).toFormat("dd LLL yyyy");
+    return DateTime.fromJSDate(dateObj, {zone: 'utc'}).toFormat("dd LLL yyyy");
   });
 
   // Get the first `n` elements of a collection.
   eleventyConfig.addFilter("head", (array, n) => {
+    if( n < 0 ) {
+      return array.slice(n);
+    }
+
     return array.slice(0, n);
   });
 
@@ -24,8 +28,8 @@ module.exports = function(eleventyConfig) {
 
   // only content in the `posts/` directory
   eleventyConfig.addCollection("posts", function(collection) {
-    return collection.getAllSorted().filter(function(item) {
-      return item.inputPath.startsWith('./posts');
+    return collection.getFilteredByGlob("./posts/*").sort(function(a, b) {
+      return a.date - b.date;
     });
   });