Question

How to calculate the week number for a given date in TypeScript

Answer 1

function getWeekNumber(date: Date): number {
    const startDate: Date = new Date(date.getFullYear(), 0, 1);
    const days: number = Math.floor((date.getTime() - startDate.getTime()) / (24 * 60 * 60 * 1000));

    return Math.ceil((days + startDate.getDay() + 1) / 7);
}

const date: Date = new Date('2025-03-14');
const weekNumber: number = getWeekNumber(date);

console.log(`Week number: ${weekNumber}`);

 
 
/*
run:
 
"Week number: 11" 
 
*/

 

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