Week numbers in JavaScript
To get the current ISO 8601 week number in JavaScript, use the following code snippet:
// Calculate ISO Week
const d = new Date();
d.setHours(0,0,0,0);
d.setDate(d.getDate() + 4 - (d.getDay()||7));
const yearStart = new Date(d.getFullYear(),0,1);
const weekNo = Math.ceil((((d - yearStart) / 86400000) + 1)/7);
console.log(weekNo);
* Ensure your system or application regional settings are set to follow ISO 8601 standards (weeks start on Monday) if the output varies.