QuarterOfYear

QuarterOfYear adds .quarter() API to return to which quarter of the year belongs a date, and extends .add .subtract .startOf .endOf APIs to support unit quarter.

var quarterOfYear = require('dayjs/plugin/quarterOfYear');
// import quarterOfYear from 'dayjs/plugin/quarterOfYear' // ES 2015

dayjs.extend(quarterOfYear);

dayjs('2010-04-01').quarter(); // 2
dayjs('2010-04-01').quarter(2);