/**
 * @license EUPL-1.2+
 * Copyright Gemeente Amsterdam
 */
/** Returns the start of the given day (midnight in local time). */
export declare const startOfDay: (date: Date) => Date;
/** Whether two dates fall on the same calendar day. */
export declare const isSameDay: (a: Date, b: Date) => boolean;
/** Whether two dates fall in the same calendar month. */
export declare const isSameMonth: (a: Date, b: Date) => boolean;
/** The number of days in the given month. */
export declare const getDaysInMonth: (year: number, month: number) => number;
/** The Monday-based weekday index (0 = Monday … 6 = Sunday) of the first day of the given month. */
export declare const getFirstWeekday: (year: number, month: number) => number;