Improved the access date javascript code

docs/_static/scripts/citation-access-date.js

@@ -8,18 +8,13 @@ document.addEventListener("DOMContentLoaded", function (event) {
         .getElementById("paper-citation")
         .querySelector("pre");
 
-    const today = new Date();
+    const todayInternationalFormat = (() => {
+        const date = new Date();
+        const year = date.getFullYear();
+        const month = date.getMonth() + 1;
+        const day = date.getDate();
+        return `${year}-${month}-${day}`;
+    })();
 
-    const year = today.getFullYear();
-    const month = today.getMonth() + 1; // Months are zero-based, so we add 1
-    const day = today.getDate();
-
-    const scientificDate =
-        year +
-        "-" +
-        month.toString().padStart(2, "0") +
-        "-" +
-        day.toString().padStart(2, "0");
-
-    dataCitation.textContent += " Accessed: " + scientificDate;
+    dataCitation.textContent += " Accessed: " + todayInternationalFormat;
 });