export declare function isValidTimezone(tz: string): boolean;
export declare function embedTimezone(cronExpression: string, tz: string): string;
export declare function parseTimezonedCron(cronExpression: string): [cron: string, tz: string];
export declare function cron(lastDate: Date, cronExpression: string): Date;
export declare function every(lastDate: Date, scheduleMeta: string): Date;
