Get bounds of a month (beginning of a month and the end of a month)

month-bounds.js

exports.getBeginningOfMonth = function getBeginningOfMonth(timestamp) {
    const d = new Date(timestamp);
    return Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), 1, 0, 0, 0, 0);
};

exports.getEndOfMonth = function getEndOfMonth(timestamp) {
    const d = new Date(timestamp);
    const end = Date.UTC(d.getUTCFullYear(), d.getUTCMonth() + 1, 1, 0, 0, 0);
    return end - 1;
};