/**
 * The function calculates the difference in days between two given dates.
 * @param {Date} a - The parameter "a" is a Date object representing the first date.
 * @param {Date} b - The parameter "b" represents the second date for which you want to calculate the
 * difference in days.
 * @returns the difference in days between two given dates.
 */
export declare const DateDiffInDays: (a: Date, b: Date) => number;