README.md
1# i18n<a name="EN-US_TOPIC_0000001101364976"></a>
2
3- [Introduction](#section11660541593)
4- [Directory Structure](#section1464106163817)
5- [Constraints](#section1718733212019)
6- [Usage](#section894511013511)
7- [Repositories Involved](#section15583142420413)
8
9## Introduction<a name="section11660541593"></a>
10
11The i18n module provides a wide array of internationalization \(i18n\) APIs for implementing functions such as date and time formatting.
12
13## Directory Structure<a name="section1464106163817"></a>
14
15The directory structure for the i18n module is as follows:
16
17```
18/base/global/
19├── i18n # Code repository for the i18n framework
20│ ├── frameworks # Core code of the i18n framework
21│ ├── interfaces # APIs
22│ │ ├── js # JavaScript APIs
23│ │ └── native # Native APIs
24```
25
26## Constraints<a name="section1718733212019"></a>
27
28**Development language**: JavaScript
29
30**Language, script, and country codes**: The supported language must be represented by a two- or three-letter code defined in the ISO 639 standard; the supported script must be represented by a four-letter code defined in the ISO 15924 standard; the supported country must be represented by a two-letter code defined in the ISO 3166 standard.
31
32## Usage<a name="section894511013511"></a>
33
34Change the date and time formats \(such as the sequence of year, month, and day, month and week names, and 12-hour or 24-hour system\) following the system settings to adapt to the cultural habits of users in different locales. For details, see the API reference. The sample code is as follows:
35
36```
37const date = new Date(2021, 11, 17, 3, 24, 0); // Create a Date object containing date and time information.
38fmt = new Intl.DateTimeFormat('en-US') // Create a DateTimeFormat instance.
39console.log(fmt.format(date)); // Format the date and time by using the DateTimeFormat instance.
40```
41
42## Repositories Involved<a name="section15583142420413"></a>
43
44Globalization subsystem
45
46**global\_i18n\_standard**
47
48global\_resmgr\_standard
49
50
