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import toInteger from "../_lib/toInteger/index.js";
import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
 * @name addDays
 * @category Day Helpers
 * @summary Add the specified number of days to the given date.
 *
 * @description
 * Add the specified number of days to the given date.
 *
 * @param {Date|Number} date - the date to be changed
 * @param {Number} amount - the amount of days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
 * @returns {Date} - the new date with the days added
 * @throws {TypeError} - 2 arguments required
 *
 * @example
 * // Add 10 days to 1 September 2014:
 * const result = addDays(new Date(2014, 8, 1), 10)
 * //=> Thu Sep 11 2014 00:00:00
 */
export default function addDays(dirtyDate, dirtyAmount) {
  requiredArgs(2, arguments);
  var date = toDate(dirtyDate);
  var amount = toInteger(dirtyAmount);
  if (isNaN(amount)) {
    return new Date(NaN);
  }
  if (!amount) {
    // If 0 days, no-op to avoid changing times in the hour before end of DST
    return date;
  }
  date.setDate(date.getDate() + amount);
  return date;
}