Fixes #4844 with more defensive date parsing

frontend/src/locale/Utils.ts

@@ -0,0 +1,42 @@
+import { fromUnixTime, intlFormat, parseISO } from "date-fns";
+
+const isUnixTimestamp = (value: unknown): boolean => {
+	if (typeof value !== "number" && typeof value !== "string") return false;
+	const num = Number(value);
+	if (!Number.isFinite(num)) return false;
+	// Check plausible Unix timestamp range: from 1970 to ~year 3000
+	// Support both seconds and milliseconds
+	if (num > 0 && num < 10000000000) return true; // seconds (<= 10 digits)
+	if (num >= 10000000000 && num < 32503680000000) return true; // milliseconds (<= 13 digits)
+	return false;
+};
+
+const parseDate = (value: string | number): Date | null => {
+	if (typeof value !== "number" && typeof value !== "string") return null;
+	try {
+		return isUnixTimestamp(value) ? fromUnixTime(+value) : parseISO(`${value}`);
+	} catch {
+		return null;
+	}
+};
+
+const formatDateTime = (value: string | number): string => {
+	const d = parseDate(value);
+	if (!d) return `${value}`;
+	try {
+		return intlFormat(d, {
+			weekday: "long",
+			year: "numeric",
+			month: "numeric",
+			day: "numeric",
+			hour: "numeric",
+			minute: "numeric",
+			second: "numeric",
+			hour12: true,
+		});
+	} catch {
+		return `${value}`;
+	}
+};
+
+export { formatDateTime, parseDate, isUnixTimestamp };