<commit_before>import addMonths from '../addMonths/index.js'
import toDate from '../toDate/index.js'
import requiredArgs from '../_lib/requiredArgs/index.js'
import toInteger from '../_lib/toInteger/index.js'

/**
 * @name add
 * @category Common Helpers
 * @summary Add the specified years, months, days, hours, minutes and seconds to the given date.
 *
 * @description
 * Add the specified years, months, days, hours, minutes and seconds to the given date.
 *
 * @param {Date|Number} date - the date to be changed
 * @param {Duration} duration - the object with years, months, days, hours, minutes and seconds to be added
 *
 * | Key            | Description                        |
 * |----------------|------------------------------------|
 * | years          | Amount of years to be added        |
 * | months         | Amount of months to be added       |
 * | days           | Amount of days to be added         |
 * | hours          | Amount of hours to be added        |
 * | minutes        | Amount of minutes to be added      |
 * | seconds        | Amount of seconds to be added      |
 *
 * All values default to 0
 *
 * @returns {Date} the new date with the seconds added
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // Add the following duration to 1 September 2014, 10:19:50
 * var result = add(new Date(2014, 8, 1, 10, 19, 50), {
 *   years: 2,
 *   months: 24,
 *   days: 7,
 *   hours: 5,
 *   minutes: 9,
 *   seconds: 30,
 * })
 * //=> Sat Sep 8 2018 15:29:20
 */
export default function add(dirtyDate, duration) {
  requiredArgs(2, arguments)

  if (!duration || typeof duration !== 'object') return new Date(NaN)

  const years = 'years' in duration ? toInteger(duration.years) : 0
  const months = 'months' in duration ? toInteger(duration.months) : 0
  const days = 'days' in duration ? toInteger(duration.days) : 0
  const hours = 'hours' in duration ? toInteger(duration.hours) : 0
  const minutes = 'minutes' in duration ? toInteger(duration.minutes) : 0
  const seconds = 'seconds' in duration ? toInteger(duration.seconds) : 0

  // Add years and months
  const dateWithMonths = addMonths(toDate(dirtyDate), months + years * 12)

  // Add days, hours, minutes and seconds
  const hoursToAdd = hours + days * 24
  const minutesToAdd = minutes + hoursToAdd * 60
  const secondsToAdd = seconds + minutesToAdd * 60
  const msToAdd = secondsToAdd * 1000
  const finalDate = new Date(dateWithMonths.getTime() + msToAdd)

  return finalDate
}<commit_msg>Use addDays inside of add to avoid wrong DST math<commit_after>import addDays from '../addDays/index.js'
import addMonths from '../addMonths/index.js'
import toDate from '../toDate/index.js'
import requiredArgs from '../_lib/requiredArgs/index.js'
import toInteger from '../_lib/toInteger/index.js'

/**
 * @name add
 * @category Common Helpers
 * @summary Add the specified years, months, days, hours, minutes and seconds to the given date.
 *
 * @description
 * Add the specified years, months, days, hours, minutes and seconds to the given date.
 *
 * @param {Date|Number} date - the date to be changed
 * @param {Duration} duration - the object with years, months, days, hours, minutes and seconds to be added
 *
 * | Key            | Description                        |
 * |----------------|------------------------------------|
 * | years          | Amount of years to be added        |
 * | months         | Amount of months to be added       |
 * | days           | Amount of days to be added         |
 * | hours          | Amount of hours to be added        |
 * | minutes        | Amount of minutes to be added      |
 * | seconds        | Amount of seconds to be added      |
 *
 * All values default to 0
 *
 * @returns {Date} the new date with the seconds added
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // Add the following duration to 1 September 2014, 10:19:50
 * var result = add(new Date(2014, 8, 1, 10, 19, 50), {
 *   years: 2,
 *   months: 24,
 *   days: 7,
 *   hours: 5,
 *   minutes: 9,
 *   seconds: 30,
 * })
 * //=> Sat Sep 8 2018 15:29:20
 */
export default function add(dirtyDate, duration) {
  requiredArgs(2, arguments)

  if (!duration || typeof duration !== 'object') return new Date(NaN)

  const years = 'years' in duration ? toInteger(duration.years) : 0
  const months = 'months' in duration ? toInteger(duration.months) : 0
  const days = 'days' in duration ? toInteger(duration.days) : 0
  const hours = 'hours' in duration ? toInteger(duration.hours) : 0
  const minutes = 'minutes' in duration ? toInteger(duration.minutes) : 0
  const seconds = 'seconds' in duration ? toInteger(duration.seconds) : 0

  // Add years and months
  const dateWithMonths = addMonths(toDate(dirtyDate), months + years * 12)

  // Add days
  const dateWithDays = addDays(dateWithMonths, days)

  // Add days, hours, minutes and seconds
  const minutesToAdd = minutes + hours * 60
  const secondsToAdd = seconds + minutesToAdd * 60
  const msToAdd = secondsToAdd * 1000
  const finalDate = new Date(dateWithDays.getTime() + msToAdd)

  return finalDate
}
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