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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);