nodemod
Version:
A collection of node modules for The Really Project
22 lines • 852 B
JavaScript
import { toUTCDate } from './to-utc-date';
function getNormalizedDate(weekNumberType, date) {
const fy = date.getUTCFullYear();
const m = date.getUTCMonth();
const d = date.getUTCDate();
const wd = date.getUTCDay();
let offset = wd;
if (weekNumberType === 'first-4-day-week')
offset = 3;
if (weekNumberType === 'first-day-of-year')
offset = 6;
if (weekNumberType === 'first-full-week')
offset = 0;
return toUTCDate(fy, m, d - wd + offset);
}
export function getWeekNumber(weekNumberType, date) {
const normalizedDate = getNormalizedDate(weekNumberType, date);
const firstDayOfYear = toUTCDate(normalizedDate.getUTCFullYear(), 0, 1);
const numDays = 1 + ((+normalizedDate - +firstDayOfYear) / 864e5);
return Math.ceil(numDays / 7);
}
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