Get Weeks In Month Through Javascript

Question

In Javascript, how do I get the number of weeks in a month? I can\'t seem to find code for this anywhere.

I need this to be able to know how many rows I need for a g

Answer 1

ES6 variant, using consistent zero-based months index. Tested for years from 2015 to 2025.

/**
 * Returns number of weeks
 *
 * @param {Number} year - full year (2018)
 * @param {Number} month - zero-based month index (0-11)
 * @param {Boolean} fromMonday - false if weeks start from Sunday, true - from Monday.
 * @returns {number}
 */
const weeksInMonth = (year, month, fromMonday = false) => {
    const first = new Date(year, month, 1);
    const last  = new Date(year, month + 1, 0);
    let dayOfWeek = first.getDay();
    if (fromMonday && dayOfWeek === 0) dayOfWeek = 7;
    let days = dayOfWeek + last.getDate();
    if (fromMonday) days -= 1;
    return Math.ceil(days / 7);
}