Prevent future date selection in jump to date (#10419)

You can still type in whatever date you want (native date input behavior) but the UI picker has future dates disabled.

Fix https://github.com/vector-im/element-web/issues/20800

src/DateUtils.ts

@@ -102,6 +102,21 @@ export function formatFullDate(date: Date, showTwelveHour = false, showSeconds =
     });
 }
 
+/**
+ * Formats dates to be compatible with attributes of a `<input type="date">`. Dates
+ * should be formatted like "2020-06-23" (formatted according to ISO8601)
+ *
+ * @param date The date to format.
+ * @returns The date string in ISO8601 format ready to be used with an `<input>`
+ */
+export function formatDateForInput(date: Date): string {
+    const year = `${date.getFullYear()}`.padStart(4, "0");
+    const month = `${date.getMonth() + 1}`.padStart(2, "0");
+    const day = `${date.getDate()}`.padStart(2, "0");
+    const dateInputValue = `${year}-${month}-${day}`;
+    return dateInputValue;
+}
+
 export function formatFullTime(date: Date, showTwelveHour = false): string {
     if (showTwelveHour) {
         return twelveHourTime(date, true);