/**
 * A function which returns the abbreviated name of the timezone. You can specify an optional date for returning the timezone name at a different point in time. The corresponding UTC date is used for locating the relevant rule. Timezone names change both historically and when they reflect the Daylight Savings Time rules.
 *
 * @param timezone - The timezone name. For example, `America/Chicago`, `Europe/Sofia`.
 * @param date - A date for which to locate the zone rule. By default, the current time is used.
 *
 * @return - The abbreviated name of the timezone at the specified date or, if not set, returns now.
 *
 * @example
 * ```ts-no-run
 * import { abbrTimezone } from '@progress/kendo-date-math';
 * import '@progress/kendo-date-math/tz/Europe/Sofia';
 *
 * const dstDate = new Date('2018-04-01T00:00:00Z');
 * console.log(abbrTimezone('Europe/Sofia', dstDate)); // EEST
 *
 * const date = new Date('2018-01-01T00:00:00Z');
 * console.log(abbrTimezone('Europe/Sofia', date); // EET
 * ```
 */
export declare const abbrTimezone: (timezone: string, date?: Date) => any;