/**
 * Number of seconds in an era.
 */
export declare const SECONDS_PER_ERA: number;
/**
 * Calculates the era that the given {@link Date} is in.
 * @param date
 * @returns
 */
export declare const calculateEra: (date: Date) => number;
/**
 * Calculates the start date of a period.
 * @param era
 * @param period
 * @returns
 */
export declare const calculatePeriodStart: (era: number, period: number) => Date;
/**
 * Calculates the start date of an era.
 * @param era
 * @returns
 */
export declare const calculateEraStart: (era: number) => Date;
/**
 * Returns the eras included in a given period.
 *
 * This is useful for figuring out what histories must be fetched.
 *
 * @param start
 * @param end
 * @returns
 */
export declare const calculateErasForPeriod: (start: Date, end: Date) => readonly number[];
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