/**
 * Checking Astrological days
 * More details @ http://cool-emerald.blogspot.sg/2013/12/myanmar-astrological-calendar-days.html
 * Get sabbath day and sabbath eve from JS date object.
 * The API deviates from the original implementation. But, should output the same result.
 * @param date JS date object
 * @returns [1=sabbath, 2=sabbath eve, 0=else]
 */
export declare const isSabbath: (date: Date) => number;