/**
 * Converts a `YYYY-MM-DD` calendar date to the absolute (UTC) ISO 8601 timestamp for the very
 * start of that day (00:00:00.000) in the browser's local time zone.
 * @param {string} date A calendar date in `YYYY-MM-DD` format, as produced by `<umb-input-date type="date">`.
 * @returns {string} The ISO 8601 timestamp, or the original string if it cannot be parsed.
 */
export declare function getStartOfDayInLocalTime(date: string): string;
/**
 * Converts a `YYYY-MM-DD` calendar date to the absolute (UTC) ISO 8601 timestamp for the very
 * end of that day (23:59:59.999) in the browser's local time zone.
 *
 * The log viewer stores entries in files bucketed by the *server's* calendar date. Sending an
 * absolute instant (rather than a bare date) lets the server resolve the correct files regardless
 * of the offset between the browser and the server, so entries logged late in the user's local day
 * are not missed when the server has already rolled over to the next date (#14710).
 * @param {string} date A calendar date in `YYYY-MM-DD` format, as produced by `<umb-input-date type="date">`.
 * @returns {string} The ISO 8601 timestamp, or the original string if it cannot be parsed.
 */
export declare function getEndOfDayInLocalTime(date: string): string;