weekOfYear
WeekOfYear 플러그인은 .week() API를 추가하여 Dayjs 객체의 연중 주차를 number 타입으로 반환합니다.
javascript
var weekOfYear = require('dayjs/plugin/weekOfYear');
// import weekOfYear from 'dayjs/plugin/weekOfYear' // ES 2015
dayjs.extend(weekOfYear);
dayjs('2018-06-27').week(); // 26
dayjs('2018-06-27').week(5); // 주차 설정