## API Report File for "@fluentui/date-time-utilities"

> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).

```ts

// @public
export function addDays(date: Date, days: number): Date;

// @public
export const addMinutes: (date: Date, minutes: number) => Date;

// @public
export function addMonths(date: Date, months: number): Date;

// @public
export function addWeeks(date: Date, weeks: number): Date;

// @public
export function addYears(date: Date, years: number): Date;

// @public
export const ceilMinuteToIncrement: (date: Date, increments: number) => Date;

// @public
export function compareDatePart(date1: Date, date2: Date): number;

// @public
export function compareDates(date1: Date, date2: Date): boolean;

// @public
export enum DateRangeType {
    // (undocumented)
    Day = 0,
    // (undocumented)
    Month = 2,
    // (undocumented)
    Week = 1,
    // (undocumented)
    WorkWeek = 3
}

// @public
export enum DayOfWeek {
    // (undocumented)
    Friday = 5,
    // (undocumented)
    Monday = 1,
    // (undocumented)
    Saturday = 6,
    // (undocumented)
    Sunday = 0,
    // (undocumented)
    Thursday = 4,
    // (undocumented)
    Tuesday = 2,
    // (undocumented)
    Wednesday = 3
}

// @public (undocumented)
export const DAYS_IN_WEEK = 7;

// @public (undocumented)
export const DEFAULT_CALENDAR_STRINGS: ICalendarStrings;

// @public (undocumented)
export const DEFAULT_DATE_FORMATTING: IDateFormatting;

// @public (undocumented)
export const DEFAULT_DATE_GRID_STRINGS: IDateGridStrings;

// @public
export const findAvailableDate: (options: IAvailableDateOptions) => Date | undefined;

// @public
export enum FirstWeekOfYear {
    // (undocumented)
    FirstDay = 0,
    // (undocumented)
    FirstFourDayWeek = 2,
    // (undocumented)
    FirstFullWeek = 1
}

// @public
export const formatDay: (date: Date) => string;

// @public
export const formatMonth: (date: Date, strings: IDateGridStrings) => string;

// @public
export const formatMonthDayYear: (date: Date, strings: IDateGridStrings) => string;

// @public
export const formatMonthYear: (date: Date, strings: IDateGridStrings) => string;

// @public
export const formatTimeString: (date: Date, showSeconds?: boolean, useHour12?: boolean) => string;

// @public
export const formatYear: (date: Date) => string;

// @public
export const getBoundedDateRange: (dateRange: Date[], minDate?: Date, maxDate?: Date) => Date[];

// @public
export const getDateFromTimeSelection: (useHour12: boolean, dateStartAnchor: Date, selectedTime: string) => Date;

// @public
export function getDatePartHashValue(date: Date): number;

// @public
export function getDateRangeArray(date: Date, dateRangeType: DateRangeType, firstDayOfWeek: DayOfWeek, workWeekDays?: DayOfWeek[], daysToSelectInDayView?: number): Date[];

// @public
export const getDateRangeTypeToUse: (dateRangeType: DateRangeType, workWeekDays: DayOfWeek[] | undefined, firstDayOfWeek: DayOfWeek) => DateRangeType;

// @public
export const getDayGrid: (options: IDayGridOptions) => IDay[][];

// @public
export function getEndDateOfWeek(date: Date, firstDayOfWeek: DayOfWeek): Date;

// @public
export function getMonthEnd(date: Date): Date;

// @public
export function getMonthStart(date: Date): Date;

// @public
export function getStartDateOfWeek(date: Date, firstDayOfWeek: DayOfWeek): Date;

// @public
export function getWeekNumber(date: Date, firstDayOfWeek: DayOfWeek, firstWeekOfYear: FirstWeekOfYear): number;

// @public
export function getWeekNumbersInMonth(weeksInMonth: number, firstDayOfWeek: DayOfWeek, firstWeekOfYear: FirstWeekOfYear, navigatedDate: Date): number[];

// @public
export function getYearEnd(date: Date): Date;

// @public
export function getYearStart(date: Date): Date;

// @public (undocumented)
export interface IAvailableDateOptions extends IRestrictedDatesOptions {
    direction: number;
    initialDate: Date;
    targetDate: Date;
}

// @public (undocumented)
export interface ICalendarStrings extends IDateGridStrings {
    closeButtonAriaLabel?: string;
    dayMarkedAriaLabel?: string;
    goToToday: string;
    monthPickerHeaderAriaLabel?: string;
    nextMonthAriaLabel?: string;
    nextYearAriaLabel?: string;
    nextYearRangeAriaLabel?: string;
    prevMonthAriaLabel?: string;
    prevYearAriaLabel?: string;
    prevYearRangeAriaLabel?: string;
    selectedDateFormatString?: string;
    todayDateFormatString?: string;
    weekNumberFormatString?: string;
    yearPickerHeaderAriaLabel?: string;
}

// @public (undocumented)
export interface IDateFormatting {
    formatDay: (date: Date) => string;
    formatMonth: (date: Date, strings: IDateGridStrings) => string;
    formatMonthDayYear: (date: Date, strings: IDateGridStrings) => string;
    formatMonthYear: (date: Date, strings: IDateGridStrings) => string;
    formatYear: (date: Date) => string;
}

// @public (undocumented)
export interface IDateGridStrings {
    days: string[];
    months: string[];
    shortDays: string[];
    shortMonths: string[];
}

// @public (undocumented)
export interface IDay {
    date: string;
    isInBounds: boolean;
    isInMonth: boolean;
    isMarked: boolean;
    isSelected: boolean;
    isToday: boolean;
    key: string;
    originalDate: Date;
}

// @public (undocumented)
export interface IDayGridOptions extends IRestrictedDatesOptions {
    dateRangeType: DateRangeType;
    daysToSelectInDayView?: number;
    firstDayOfWeek: DayOfWeek;
    firstWeekOfYear: FirstWeekOfYear;
    markedDays?: Date[];
    navigatedDate: Date;
    selectedDate: Date;
    showWeekNumbers?: boolean;
    today?: Date;
    weeksToShow?: number;
    workWeekDays?: DayOfWeek[];
}

// @public (undocumented)
export interface IRestrictedDatesOptions {
    maxDate?: Date;
    minDate?: Date;
    restrictedDates?: Date[];
}

// @public
export const isAfterMaxDate: (date: Date, options: IRestrictedDatesOptions) => boolean;

// @public
export const isBeforeMinDate: (date: Date, options: IRestrictedDatesOptions) => boolean;

// @public
export const isContiguous: (days: DayOfWeek[], isSingleWeek: boolean, firstDayOfWeek: DayOfWeek) => boolean;

// @public
export function isInDateRangeArray(date: Date, dateRange: Date[]): boolean;

// @public
export const isRestrictedDate: (date: Date, options: IRestrictedDatesOptions) => boolean;

// @public
export enum MonthOfYear {
    // (undocumented)
    April = 3,
    // (undocumented)
    August = 7,
    // (undocumented)
    December = 11,
    // (undocumented)
    February = 1,
    // (undocumented)
    January = 0,
    // (undocumented)
    July = 6,
    // (undocumented)
    June = 5,
    // (undocumented)
    March = 2,
    // (undocumented)
    May = 4,
    // (undocumented)
    November = 10,
    // (undocumented)
    October = 9,
    // (undocumented)
    September = 8
}

// @public
export function setMonth(date: Date, month: number): Date;

// @public (undocumented)
export const TimeConstants: {
    MillisecondsInOneDay: number;
    MillisecondsIn1Sec: number;
    MillisecondsIn1Min: number;
    MillisecondsIn30Mins: number;
    MillisecondsIn1Hour: number;
    MinutesInOneDay: number;
    MinutesInOneHour: number;
    DaysInOneWeek: number;
    MonthInOneYear: number;
    HoursInOneDay: number;
    SecondsInOneMinute: number;
    OffsetTo24HourFormat: number;
    TimeFormatRegex: RegExp;
};

// (No @packageDocumentation comment for this package)

```