export declare const MILLISECONDS = 1, SECONDS = 1000, MINUTES: number, HOURS: number, DAYS: number, ONE_SECOND = 1000, ONE_MINUTE: number, ONE_HOUR: number, ONE_DAY: number;
/**
 * Is a Date or UTC time stamp older than a certain amount?
 * Returns true if input time is null.
 */
export declare function olderThan(t: Date | number, millis: number): boolean;
/** Returns midnight browser local time for the provided date, or current date. */
export declare function startOfDay(date?: Date): Date;
/** Returns 11:59:59pm browser local time for the provided date, or current date. */
export declare function endOfDay(date?: Date): Date;