import type BN from 'bn.js';
/**
 *  Convert a Date object to YYYY-MM-DD HH:mm:ss
 *
 *  TODO: Remove this when pulled out from old code.
 */
export declare function toDateTimeString(d: Date | undefined): string;
/**
 *  Convert an BN timestamp to YYYY-MM-DD HH:mm:ss
 *
 *  TODO: Remove this when pulled out from old code.
 */
export declare function BNtoDateTimeString(ts: BN): string;
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