# Week Year (ISO)

URL: https://caijiao.org/dayjs/get-set/iso-week-year
Source: docs/dayjs/get-set/iso-week-year.md
Description: 获取 ISO 周年这依赖 IsoWeek 插件，才能正常运行dayjs.extend(isoWeek); dayjs().isoWeekYear();

获取 [ISO 周年](https://en.wikipedia.org/wiki/ISO_week_date)。


```javascript
dayjs.extend(isoWeek);

dayjs().isoWeekYear();
```