export declare const DayOfMonthSymbol: unique symbol;
export declare const DayOfRangeMonthSymbol: unique symbol;
export declare enum DayName {
    MONDAY = "MONDAY",
    TUESDAY = "TUESDAY",
    WEDNESDAY = "WEDNESDAY",
    THURSDAY = "THURSDAY",
    FRIDAY = "FRIDAY",
    SATURDAY = "SATURDAY",
    SUNDAY = "SUNDAY"
}
export declare const DaysOfTheWeek: DayName[];
export interface DayOfMonth {
    readonly __type: typeof DayOfMonthSymbol;
    readonly dateObj: Date;
    readonly dayName: DayName;
    readonly inCurrentMonth: boolean;
    readonly ISODateString: string;
}
export interface DayOfRangeMonth extends Omit<DayOfMonth, "__type"> {
    readonly __type: typeof DayOfRangeMonthSymbol;
    readonly inRange: boolean;
    readonly isStart: boolean;
    readonly isEnd: boolean;
}
export interface Month {
    readonly days: DayOfMonth[];
    readonly daysOfWeek: DayName[];
    readonly month: Date;
}
export interface RangeMonth {
    readonly days: DayOfRangeMonth[];
    readonly month: Date;
}
export interface RangeMonths {
    readonly months: RangeMonth[];
    readonly daysOfWeek: DayName[];
}
export declare function addDays(date: Date, days: number): Date;
export declare function addMonths(date: Date, months: number): Date;
export declare function setDay(date: Date, day: number): Date;
export declare function setMonth(date: Date, month: number): Date;
export declare function setYear(date: Date, year: number): Date;
export declare function startOfMonth(date: Date): Date;
export declare function endOfMonth(date: Date): Date;
export declare function isSameMonth(dateLeft: Date, dateRight: Date): boolean;
export declare function isSameDay(dateLeft: Date, dateRight: Date): boolean;
export declare function isDayAfter(date: Date, dateToCompare: Date): boolean;
export declare function isDayBefore(date: Date, dateToCompare: Date): boolean;
export declare function toISODateString(date: Date): string;
export declare function callIfExists<T extends unknown[], U = unknown>(func: ((...args: T) => U) | undefined | null, ...args: T): U | undefined;
export declare function getDaysOfMonth(month: Date, weekStartsOn?: DayName): Month;
export declare function getDaysOfRangeMonth(rangeMonths: Date[], startDate?: Date | null, endDate?: Date | null, weekStartsOn?: DayName): RangeMonths;
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