@jsbits/add-months/index.mjs

Adds or subtracts N months to any JavaScript Date, local or UTC.

/*
  @jsbits/add-months
  @author aMarCruz
  @version 1.1.2 ESM+ES6
  @license MIT
*/
/* eslint-disable */

const addMonthsLoc = (date, count) => {
    const day = date.getDate();
    date.setMonth(date.getMonth() + count, day > 28 ? 28 : day);
    if (day > 28) {
        const month = date.getMonth();
        date.setDate(day);
        if (date.getMonth() !== month) {
            date.setDate(0);
        }
    }
    return date;
};
const addMonthsUTC = (date, count) => {
    const day = date.getUTCDate();
    date.setUTCMonth(date.getUTCMonth() + count, day > 28 ? 28 : day);
    if (day > 28) {
        const month = date.getUTCMonth();
        date.setUTCDate(day);
        if (date.getUTCMonth() !== month) {
            date.setUTCDate(0);
        }
    }
    return date;
};
const _toString = Object.prototype.toString;
const toDate = (src) => {
    const type = _toString.call(src);
    return new Date(type === '[object Date]' || type === '[object Number]' ? +src : NaN);
};
/**
 * Returns a date occurring `count` months after `startdate` or, if `count` is
 * negative, the date occurring `count` months before `startdate`.
 *
 * - If `startdate` is not a Date or number that can be converted to a
 *    valid date, returns a new Date instance with an invalid date.
 *
 * - If `count` is evaluated as zero, returns a new Date instance with the
 *    the same value as `startdate`.
 *
 * - If there is an overflow in the day, the date is adjusted to the last
 *    valid day of the expected month.
 *
 * The third parameter is optional and indicates if the date is UTC. It is
 * necessary to differentiate UTC dates from locals and avoid errors due to the
 * [Daylight Saving Time](https://en.wikipedia.org/wiki/Daylight_saving_time)
 * (DST).
 *
 * This function does not change the original date.
 *
 * @param {Date|number} startdate A value parseable as a JavaScript Date
 * @param {number} count Number of months to add or subtract
 * @param {boolean} [asUTC=false] If `true`, handle the date as UTC
 * @returns {Date} A new, adjusted Date instance.
 * @since 1.0.0
 */
const addMonths = function _addMonths(startdate, count, asUTC) {
    const date = toDate(startdate);
    count |= 0;
    if (!count || isNaN(date)) {
        return date;
    }
    return asUTC ? addMonthsUTC(date, count) : addMonthsLoc(date, count);
};

export default addMonths;
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