move date-fmt to the bitty script

data/static/js/bitties/pyrom-bitty.js

@@ -246,4 +246,12 @@ export default class {
     el.scrollIntoView();
     el.focus();
   }
+
+  convertTimestamps(ev, el) {
+    const timestamp = el.getInt('utc');
+    if (!isNaN(timestamp)) {
+      const date = new Date(timestamp * 1000);
+      el.textContent = date.toLocaleString();
+    }
+  }
 }

data/static/js/date-fmt.js

@@ -1,10 +0,0 @@
-document.addEventListener("DOMContentLoaded", () => {
-  const timestampSpans = document.getElementsByClassName("timestamp");
-  for (let timestampSpan of timestampSpans) {
-    const timestamp = parseInt(timestampSpan.dataset.utc);
-    if (!isNaN(timestamp)) {
-      const date = new Date(timestamp * 1000);
-      timestampSpan.textContent = date.toLocaleString();
-    }
-  }
-})