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kirkegaard/getWeekNumber.js

Created June 29, 2020 17:22
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getWeekNumber.js
const getWeekNumber = (date) => {
const pd = new Date(date);
const sj = new Date(pd.getFullYear(), 0, 1);
const wk = Math.ceil((((pd - sj) / 86400000) + sj.getDay() + 1) / 7);
return wk;
}
console.log(
getWeekNumber('2020-01-01'),
getWeekNumber('2020-01-14'),
getWeekNumber('2020-06-29'),
);
// 1 3 27
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