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date-io

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Abstraction over common javascript date management libraries

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# date-io

Abstraction over common JavaScript date management libraries.

[![npm package](https://img.shields.io/npm/v/@date-io/core.svg)](https://www.npmjs.org/package/@date-io/core)
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[![typescript](https://img.shields.io/badge/typescript-first-blue.svg)](https://github.com/dmtrKovalenko/date-io)
[![travis](https://travis-ci.org/dmtrKovalenko/date-io.svg?branch=master)](https://travis-ci.org/dmtrKovalenko/date-io)
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[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)

The project exposes an abstraction interface over [luxon](https://moment.github.io/luxon/), [date-fns v4](https://github.com/date-fns/date-fns), [dayjs](https://github.com/iamkun/dayjs) and [moment](https://momentjs.com/).
It allows you to build any UI date or time components while utilizing the same date management library in use within your user's project.

It simplifies timezone management, allows your code to return the exact same type that your user expects and works with specific calendar systems (e.g. [Jalali calendar](https://en.wikipedia.org/wiki/Jalali_calendar))

### Projects

| Library                  |                                                                                                                             Downloads |
| ------------------------ | ------------------------------------------------------------------------------------------------------------------------------------: |
| @date-io/date-fns        |               [![npm download](https://img.shields.io/npm/dm/@date-io/date-fns.svg)](https://www.npmjs.org/package/@date-io/date-fns) |
| @date-io/moment          |                   [![npm download](https://img.shields.io/npm/dm/@date-io/moment.svg)](https://www.npmjs.org/package/@date-io/moment) |
| @date-io/luxon           |                     [![npm download](https://img.shields.io/npm/dm/@date-io/luxon.svg)](https://www.npmjs.org/package/@date-io/luxon) |
| @date-io/dayjs           |                     [![npm download](https://img.shields.io/npm/dm/@date-io/dayjs.svg)](https://www.npmjs.org/package/@date-io/dayjs) |
| @date-io/js-joda         |                 [![npm download](https://img.shields.io/npm/dm/@date-io/js-joda.svg)](https://www.npmjs.org/package/@date-io/js-joda) |
| @date-io/date-fns-jalali | [![npm download](https://img.shields.io/npm/dm/@date-io/date-fns-jalali.svg)](https://www.npmjs.org/package/@date-io/date-fns-jalali) |
| @date-io/jalaali         |                 [![npm download](https://img.shields.io/npm/dm/@date-io/jalaali.svg)](https://www.npmjs.org/package/@date-io/jalaali) |
| @date-io/hijri           |                     [![npm download](https://img.shields.io/npm/dm/@date-io/hijri.svg)](https://www.npmjs.org/package/@date-io/hijri) |

### Usage example

```js
import LuxonAdapter from "@date-io/luxon";
import DateFnsAdapter from "@date-io/date-fns";

const dateFns = new DateFnsAdapter();
const luxon = new LuxonAdapter({ locale: "fr" }); // pass french locale

const initialLuxonDate = luxon.date("2018-10-28T11:44:00.000Z");
const initialDateFnsDate = dateFns.date("2018-10-28T11:44:00.000Z");

const updatedLuxonDate = luxon.addDays(initialLuxonDate, 2);
const updatedDateFnsDate = dateFns.addDays(initialDateFnsDate, 2);

luxon.format(updatedLuxonDate, "fullDateTime24h"); // "2018, octobre 30 11:44"
dateFns.format(updatedLuxonDate, "fullDateTime24h"); // "2018, October 30th 11:44"
```

### Interface

The implemented interface. If you cannot find the method you require, please let us know, and we will add it!

Localized output will of course vary based on the locale and date library used. Inline examples here are based on using
`moment` with the `en-US` locale.

```tsx
export interface DateIOFormats<TLibFormatToken = string> {
  /** Localized full date @example "Jan 1, 2019" */
  fullDate: TLibFormatToken;
  /** Partially localized full date with weekday, useful for text-to-speech accessibility @example "Tuesday, January 1, 2019" */
  fullDateWithWeekday: TLibFormatToken;
  /** Date format string with month and day of month @example "1 January" */
  normalDate: TLibFormatToken;
  /** Date format string with weekday, month and day of month @example "Wed, Jan 1" */
  normalDateWithWeekday: TLibFormatToken;
  /** Shorter day format @example "Jan 1" */
  shortDate: TLibFormatToken;
  /** Year format string @example "2019" */
  year: TLibFormatToken;
  /** Month format string @example "January" */
  month: TLibFormatToken;
  /** Short month format string @example "Jan" */
  monthShort: TLibFormatToken;
  /** Month with year format string @example "January 2018" */
  monthAndYear: TLibFormatToken;
  /** Month with date format string @example "January 1" */
  monthAndDate: TLibFormatToken;
  /** Weekday format string @example "Wednesday" */
  weekday: TLibFormatToken;
  /** Short weekday format string @example "Wed" */
  weekdayShort: TLibFormatToken;
  /** Day format string @example "1" */
  dayOfMonth: TLibFormatToken;
  /** Hours format string @example "11" */
  hours12h: TLibFormatToken;
  /** Hours format string @example "23" */
  hours24h: TLibFormatToken;
  /** Minutes format string @example "44" */
  minutes: TLibFormatToken;
  /** Seconds format string @example "00" */
  seconds: TLibFormatToken;
  /** Full time localized format string @example "11:44 PM" for US, "23:44" for Europe */
  fullTime: TLibFormatToken;
  /** Not localized full time format string @example "11:44 PM" */
  fullTime12h: TLibFormatToken;
  /** Not localized full time format string @example "23:44" */
  fullTime24h: TLibFormatToken;
  /** Date & time format string with localized time @example "Jan 1, 2018 11:44 PM" */
  fullDateTime: TLibFormatToken;
  /** Not localized date & Time format 12h @example "Jan 1, 2018 11:44 PM" */
  fullDateTime12h: TLibFormatToken;
  /** Not localized date & Time format 24h @example "Jan 1, 2018 23:44" */
  fullDateTime24h: TLibFormatToken;
  /** Localized keyboard input friendly date format @example "02/13/2020 */
  keyboardDate: TLibFormatToken;
  /** Localized keyboard input friendly date/time format @example "02/13/2020 23:44" */
  keyboardDateTime: TLibFormatToken;
  /** Partially localized keyboard input friendly date/time 12h format @example "02/13/2020 11:44 PM" */
  keyboardDateTime12h: TLibFormatToken;
  /** Partially localized keyboard input friendly date/time 24h format @example "02/13/2020 23:44" */
  keyboardDateTime24h: TLibFormatToken;
}

export interface IUtils<TDate> {
  formats: DateIOFormats<any>;
  locale?: any;
  moment?: any;
  dayjs?: any;
  /** Name of the library that is used right now */
  lib: string;

// constructor (options?: { formats?: DateIOFormats, locale?: any, instance?: any });

date(value?: any): TDate | null;
  toJsDate(value: TDate): Date;
  parseISO(isString: string): TDate;
  toISO(value: TDate): string;
  parse(value: string, format: string): TDate | null;

getCurrentLocaleCode(): string;
  is12HourCycleInCurrentLocale(): boolean;
  /** Returns user readable format (taking into account localized format tokens), useful to render helper text for input (e.g. placeholder). For luxon always returns empty string. */
  getFormatHelperText(format: string): string;

isNull(value: TDate | null): boolean;
  isValid(value: any): boolean;
  getDiff(value: TDate, comparing: TDate | string, unit?: Unit): number;
  isEqual(value: any, comparing: any): boolean;

isSameDay(value: TDate, comparing: TDate): boolean;
  isSameMonth(value: TDate, comparing: TDate): boolean;
  isSameYear(value: TDate, comparing: TDate): boolean;
  isSameHour(value: TDate, comparing: TDate): boolean;

isAfter(value: TDate, comparing: TDate): boolean;
  isAfterDay(value: TDate, comparing: TDate): boolean;
  isAfterYear(value: TDate, comparing: TDate): boolean;

isBeforeDay(value: TDate, comparing: TDate): boolean;
  isBeforeYear(value: TDate, comparing: TDate): boolean;
  isBefore(value: TDate, comparing: TDate): boolean;

isWithinRange(value: TDate, range: [TDate, TDate]): boolean;

startOfYear(value: TDate): TDate;
  endOfYear(value: TDate): TDate;
  startOfMonth(value: TDate): TDate;
  endOfMonth(value: TDate): TDate;
  startOfWeek(value: TDate): TDate;
  endOfWeek(value: TDate): TDate;

addSeconds(value: TDate, count: number): TDate;
  addMinutes(value: TDate, count: number): TDate;
  addHours(value: TDate, count: number): TDate;
  addDays(value: TDate, count: number): TDate;
  addWeeks(value: TDate, count: number): TDate;
  addMonths(value: TDate, count: number): TDate;
  addYears(value: TDate, count: number): TDate;

startOfDay(value: TDate): TDate;
  endOfDay(value: TDate): TDate;

format(value: TDate, formatKey: keyof DateIOFormats): string;
  formatByString(value: TDate, formatString: string): string;
  formatNumber(numberToFormat: string): string;

getHours(value: TDate): number;
  setHours(value: TDate, count: number): TDate;

getMinutes(value: TDate): number;
  setMinutes(value: TDate, count: number): TDate;

getSeconds(value: TDate): number;
  setSeconds(value: TDate, count: number): TDate;

getDate(value: TDate): number;
  setDate(value: TDate, count: number): TDate;

getMonth(value: TDate): number;
  getDaysInMonth(value: TDate): number;
  setMonth(value: TDate, count: number): TDate;
  getNextMonth(value: TDate): TDate;
  getPreviousMonth(value: TDate): TDate;

getMonthArray(value: TDate): TDate[];

getYear(value: TDate): number;
  setYear(value: TDate, count: number): TDate;

mergeDateAndTime(date: TDate, time: TDate): TDate;

getWeekdays(): string[];
  getWeekArray(date: TDate): TDate[][];
  getYearRange(start: TDate, end: TDate): TDate[];

/** Allow to customize displaying "am/pm" strings */
  getMeridiemText(ampm: "am" | "pm"): string;
}
```

### For library authors

If you are a library author that exposes date/time management utils or controls you may want to use date-io to interop with the most popular libraries. Here are some instructions on how to use date-fns as an adapter.

#### 1. Install the bindings

First of all, it is required to provide the adapters for your users. We do not recommend installing the date-io directly by the end users, cause it may be easy to mismatch the version. The better way will be to reexport them.

Firstly install all the adapters you want to support and lock the version.

> Yes, you will install all of them as dependencies. But every adapter is 50kb unpacked npm module and relieas to the library as for **optional peer dependency**. It **won't** be included in user bundle until user will choose which library he want's to use.

```json
{
  "dependencies": {
    "@date-io/date-fns": "x.x.x",
    "@date-io/dayjs": "x.x.x",
    "@date-io/luxon": "x.x.x",
    "@date-io/date-fns-jalali": "x.x.x",
    "@date-io/jalaali": "x.x.x"
  }
}
```

#### 2. Reexport the bindings

```js
// you-awesome-lib/adapters/date-fns
export { default } from "@date-io/date-fns";
```

#### 3. Use it for date-time management

Register it using your library context. It may be react context, dependency injection container or any other tool that allows the user to register the used library **1 time**.

```tsx
// react example
import { createMyAdapter } from "your-awesome-lib/adapters/date-fns";

<DateLibProvider adapter={createMyAdapter({ locale: "fr" })}>
  {/* ... */}
</DateLibProvider>;
```

And use the interface of date-io (or your custom interface).

```ts
import { IUtils } from "@date-io/core/IUtils";

function myFunctionInLibrary<TDate>(date: TDate, adapter: IUtils<TDate>) {
  // ...
  const weekArray = adapter.getWeekArray(Date);
  // ...
}
```

### Overriding behavior

It is possible to change or extend the behavior of any adapter by simply inheriting and overriding the base class of utils while saving the same interface.

Let's say you want to override `getYear` to always return 2007 and `getWeekdays` to contain only 2 weekends (let's admit that this is what we all desire) you can do the following:

```ts
class CustomDateTime extends DayjsUtils implements IUtils<Dayjs> {
  getWeekdays = () => {
    const start = this.dayjs().startOf("week");
    return [0, 1].map((diff) => this.formatByString(start.add(diff, "day"), "dd"));
  };
}
```

Note: that you will need to do this with every adapter you want to support to be in sync.

### Extending behavior

It is possible also to add custom functionality to the adapter, in case the author of date-io doesn't want to add it. To do this create **your custom interface that extends IUtils** and inherit your adapters both from the base adapter and your custom interface.

```ts
// your-awesome-lib/adapters/CustomAdapter
import { IUtils } from "@date-io/core/IUtils";
import DateIODateFnsAdapter from "@date-io/date-fns";

interface CustomUtils<TDate> extends  IUtils<TDate> {
  getDayOfYear(day: TDate): number;
}

interface CustomDateFnsUtils extends DateIODateFnsAdapter implements CustomUtils<Date> {
  getDayOfYear(day: Date): number {
    return getDayOfYear(day);
  }
}
```

### Build system

In some build systems (hello babel) it may be impossible to extend the methods because they are defined as class properties. While it should be standardized already there are still some issues with it. In this case you can use the following workaround:

```ts
// you-awesome-lib/adapters/date-fns
import { CustomUtils } from "../CustomUtils";
import getDayOfYear from "date-fns/getDayOfYear";
import DateIODateFnsAdapter from "@date-io/date-fns";

export const createMyAdapter(options) {
  const dateFns = new DateFnsUtils(options)

const adapter = {
    ...dateFns,

getWeekArray() {
      const startDate = endOfWeek(adapter.endOfMonth(date), { locale: adapter.locale })
      const extraWeek = adapter.getWeekdays().map((day, index) => adapter.addDays(startDate, index + 1))
      return [...dateFns.getWeekArray(date), extraWeek]
    },

// ...
  }

return adapter
}
```

date-io

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