/**
 * Returns the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC.
 */
export declare function unixTimeInMilliseconds(offset?: number): number;
/**
 * Returns the number of seconds elapsed since January 1, 1970 00:00:00 UTC.
 */
export declare function unixTimeInSeconds(offset?: number): number;
/**
 * Validates a unix time
 * @param timestamp unix time stamp
 * @param format seconds | milliseconds
 */
export declare function validateUnixTime(timestamp: number, format: 'seconds' | 'milliseconds'): boolean;