Fix date-based post header links

Posts without an explicit title render the date as the post header in
lists of posts (like on the blog index and tag pages). This updates
localdate.js to properly adjust those dates, too.

static/js/localdate.js

@@ -1,9 +1,16 @@
-function toLocalDate(el) {
-	var d = new Date(el.getAttribute("datetime"));
-	el.textContent = d.toLocaleDateString(navigator.language || "en-US", { year: 'numeric', month: 'long', day: 'numeric' });
+function toLocalDate(dateEl, displayEl) {
+	var d = new Date(dateEl.getAttribute("datetime"));
+	displayEl.textContent = d.toLocaleDateString(navigator.language || "en-US", { year: 'numeric', month: 'long', day: 'numeric' });
 }
 
-var $dates = document.querySelectorAll("time");
+// Adjust dates on individual post pages, and on posts in a list *with* an explicit title
+var $dates = document.querySelectorAll("article > time");
 for (var i=0; i < $dates.length; i++) {
-	toLocalDate($dates[i]);
+	toLocalDate($dates[i], $dates[i]);
+}
+
+// Adjust dates on posts in a list without an explicit title, where they act as the header
+$dates = document.querySelectorAll("h2.post-title > time");
+for (i=0; i < $dates.length; i++) {
+	toLocalDate($dates[i], $dates[i].querySelector('a'));
 }