add proper window open/close dates

static/scripts/dates.js

@@ -0,0 +1,40 @@
+// Converts server dates to local time.
+function changeDates() {
+  const dateEls = document.querySelectorAll(".date");
+  const today = new Date();
+  const tomorrow = new Date(
+    today.getFullYear(),
+    today.getMonth(),
+    today.getDate() + 1,
+  );
+  dateEls.forEach((el) => {
+    const date = new Date(Number(el.dataset.ts)); // This is UTC
+    const inner = el.querySelector(".inner");
+    // Fallback: Normal date string representation
+    let string = date.toString();
+    const intl = new Intl.DateTimeFormat(undefined, {
+      month: "2-digit",
+      day: "2-digit",
+      hour: "2-digit",
+      minute: "2-digit",
+    });
+    const intlTimeOnly = new Intl.DateTimeFormat(undefined, {
+      hour: "2-digit",
+      minute: "2-digit",
+    });
+    if (date.getDate() - today.getDate() == 0) {
+      // If today
+      string = `Today, ${intlTimeOnly.format(date)}`;
+    } else if (date.getDate() - tomorrow.getDate() == 0) {
+      // If tomorrow
+      string = `Tomorrow, ${intlTimeOnly.format(date)}`;
+    } else {
+      // Use a proper formatted string
+      string = intl.format(date);
+    }
+
+    inner.innerHTML = string;
+  });
+}
+
+changeDates();