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+import toInteger from '../_lib/toInteger/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+var MILLISECONDS_IN_HOUR = 3600000
+var MILLISECONDS_IN_MINUTE = 60000
+var DEFAULT_ADDITIONAL_DIGITS = 2
+
+var patterns = {
+  dateTimeDelimiter: /[T ]/,
+  timeZoneDelimiter: /[Z ]/i,
+  timezone: /([Z+-].*)$/,
+}
+
+var dateRegex = /^-?(?:(\d{3})|(\d{2})(?:-?(\d{2}))?|W(\d{2})(?:-?(\d{1}))?|)$/
+var timeRegex = /^(\d{2}(?:[.,]\d*)?)(?::?(\d{2}(?:[.,]\d*)?))?(?::?(\d{2}(?:[.,]\d*)?))?$/
+var timezoneRegex = /^([+-])(\d{2})(?::?(\d{2}))?$/
+
+/**
+ * @name parseISO
+ * @category Common Helpers
+ * @summary Parse ISO string
+ *
+ * @description
+ * Parse the given string in ISO 8601 format and return an instance of Date.
+ *
+ * Function accepts complete ISO 8601 formats as well as partial implementations.
+ * ISO 8601: http://en.wikipedia.org/wiki/ISO_8601
+ *
+ * If the argument isn't a string, the function cannot parse the string or
+ * the values are invalid, it returns Invalid Date.
+ *
+ * ### v2.0.0 breaking changes:
+ *
+ * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
+ *
+ * - The previous `parse` implementation was renamed to `parseISO`.
+ *
+ *   ```javascript
+ *   // Before v2.0.0
+ *   parse('2016-01-01')
+ *
+ *   // v2.0.0 onward
+ *   parseISO('2016-01-01')
+ *   ```
+ *
+ * - `parseISO` now validates separate date and time values in ISO-8601 strings
+ *   and returns `Invalid Date` if the date is invalid.
+ *
+ *   ```javascript
+ *   parseISO('2018-13-32')
+ *   //=> Invalid Date
+ *   ```
+ *
+ * - `parseISO` now doesn't fall back to `new Date` constructor
+ *   if it fails to parse a string argument. Instead, it returns `Invalid Date`.
+ *
+ * @param {String} argument - the value to convert
+ * @param {Object} [options] - an object with options.
+ * @param {0|1|2} [options.additionalDigits=2] - the additional number of digits in the extended year format
+ * @returns {Date} the parsed date in the local time zone
+ * @throws {TypeError} 1 argument required
+ * @throws {RangeError} `options.additionalDigits` must be 0, 1 or 2
+ *
+ * @example
+ * // Convert string '2014-02-11T11:30:30' to date:
+ * var result = parseISO('2014-02-11T11:30:30')
+ * //=> Tue Feb 11 2014 11:30:30
+ *
+ * @example
+ * // Convert string '+02014101' to date,
+ * // if the additional number of digits in the extended year format is 1:
+ * var result = parseISO('+02014101', { additionalDigits: 1 })
+ * //=> Fri Apr 11 2014 00:00:00
+ */
+export default function parseISO(argument, dirtyOptions) {
+  requiredArgs(1, arguments)
+
+  var options = dirtyOptions || {}
+
+  var additionalDigits =
+    options.additionalDigits == null
+      ? DEFAULT_ADDITIONAL_DIGITS
+      : toInteger(options.additionalDigits)
+  if (
+    additionalDigits !== 2 &&
+    additionalDigits !== 1 &&
+    additionalDigits !== 0
+  ) {
+    throw new RangeError('additionalDigits must be 0, 1 or 2')
+  }
+
+  if (
+    !(
+      typeof argument === 'string' ||
+      Object.prototype.toString.call(argument) === '[object String]'
+    )
+  ) {
+    return new Date(NaN)
+  }
+
+  var dateStrings = splitDateString(argument)
+
+  var date
+  if (dateStrings.date) {
+    var parseYearResult = parseYear(dateStrings.date, additionalDigits)
+    date = parseDate(parseYearResult.restDateString, parseYearResult.year)
+  }
+
+  if (isNaN(date) || !date) {
+    return new Date(NaN)
+  }
+
+  var timestamp = date.getTime()
+  var time = 0
+  var offset
+
+  if (dateStrings.time) {
+    time = parseTime(dateStrings.time)
+    if (isNaN(time) || time === null) {
+      return new Date(NaN)
+    }
+  }
+
+  if (dateStrings.timezone) {
+    offset = parseTimezone(dateStrings.timezone)
+    if (isNaN(offset)) {
+      return new Date(NaN)
+    }
+  } else {
+    var dirtyDate = new Date(timestamp + time)
+    // js parsed string assuming it's in UTC timezone
+    // but we need it to be parsed in our timezone
+    // so we use utc values to build date in our timezone.
+    // Year values from 0 to 99 map to the years 1900 to 1999
+    // so set year explicitly with setFullYear.
+    var result = new Date(0)
+    result.setFullYear(
+      dirtyDate.getUTCFullYear(),
+      dirtyDate.getUTCMonth(),
+      dirtyDate.getUTCDate()
+    )
+    result.setHours(
+      dirtyDate.getUTCHours(),
+      dirtyDate.getUTCMinutes(),
+      dirtyDate.getUTCSeconds(),
+      dirtyDate.getUTCMilliseconds()
+    )
+    return result
+  }
+
+  return new Date(timestamp + time + offset)
+}
+
+function splitDateString(dateString) {
+  var dateStrings = {}
+  var array = dateString.split(patterns.dateTimeDelimiter)
+  var timeString
+
+  // The regex match should only return at maximum two array elements.
+  // [date], [time], or [date, time].
+  if (array.length > 2) {
+    return dateStrings
+  }
+
+  if (/:/.test(array[0])) {
+    dateStrings.date = null
+    timeString = array[0]
+  } else {
+    dateStrings.date = array[0]
+    timeString = array[1]
+    if (patterns.timeZoneDelimiter.test(dateStrings.date)) {
+      dateStrings.date = dateString.split(patterns.timeZoneDelimiter)[0]
+      timeString = dateString.substr(dateStrings.date.length, dateString.length)
+    }
+  }
+
+  if (timeString) {
+    var token = patterns.timezone.exec(timeString)
+    if (token) {
+      dateStrings.time = timeString.replace(token[1], '')
+      dateStrings.timezone = token[1]
+    } else {
+      dateStrings.time = timeString
+    }
+  }
+
+  return dateStrings
+}
+
+function parseYear(dateString, additionalDigits) {
+  var regex = new RegExp(
+    '^(?:(\\d{4}|[+-]\\d{' +
+      (4 + additionalDigits) +
+      '})|(\\d{2}|[+-]\\d{' +
+      (2 + additionalDigits) +
+      '})$)'
+  )
+
+  var captures = dateString.match(regex)
+  // Invalid ISO-formatted year
+  if (!captures) return { year: null }
+
+  var year = captures[1] && parseInt(captures[1])
+  var century = captures[2] && parseInt(captures[2])
+
+  return {
+    year: century == null ? year : century * 100,
+    restDateString: dateString.slice((captures[1] || captures[2]).length),
+  }
+}
+
+function parseDate(dateString, year) {
+  // Invalid ISO-formatted year
+  if (year === null) return null
+
+  var captures = dateString.match(dateRegex)
+  // Invalid ISO-formatted string
+  if (!captures) return null
+
+  var isWeekDate = !!captures[4]
+  var dayOfYear = parseDateUnit(captures[1])
+  var month = parseDateUnit(captures[2]) - 1
+  var day = parseDateUnit(captures[3])
+  var week = parseDateUnit(captures[4])
+  var dayOfWeek = parseDateUnit(captures[5]) - 1
+
+  if (isWeekDate) {
+    if (!validateWeekDate(year, week, dayOfWeek)) {
+      return new Date(NaN)
+    }
+    return dayOfISOWeekYear(year, week, dayOfWeek)
+  } else {
+    var date = new Date(0)
+    if (
+      !validateDate(year, month, day) ||
+      !validateDayOfYearDate(year, dayOfYear)
+    ) {
+      return new Date(NaN)
+    }
+    date.setUTCFullYear(year, month, Math.max(dayOfYear, day))
+    return date
+  }
+}
+
+function parseDateUnit(value) {
+  return value ? parseInt(value) : 1
+}
+
+function parseTime(timeString) {
+  var captures = timeString.match(timeRegex)
+  if (!captures) return null // Invalid ISO-formatted time
+
+  var hours = parseTimeUnit(captures[1])
+  var minutes = parseTimeUnit(captures[2])
+  var seconds = parseTimeUnit(captures[3])
+
+  if (!validateTime(hours, minutes, seconds)) {
+    return NaN
+  }
+
+  return (
+    hours * MILLISECONDS_IN_HOUR +
+    minutes * MILLISECONDS_IN_MINUTE +
+    seconds * 1000
+  )
+}
+
+function parseTimeUnit(value) {
+  return (value && parseFloat(value.replace(',', '.'))) || 0
+}
+
+function parseTimezone(timezoneString) {
+  if (timezoneString === 'Z') return 0
+
+  var captures = timezoneString.match(timezoneRegex)
+  if (!captures) return 0
+
+  var sign = captures[1] === '+' ? -1 : 1
+  var hours = parseInt(captures[2])
+  var minutes = (captures[3] && parseInt(captures[3])) || 0
+
+  if (!validateTimezone(hours, minutes)) {
+    return NaN
+  }
+
+  return (
+    sign * (hours * MILLISECONDS_IN_HOUR + minutes * MILLISECONDS_IN_MINUTE)
+  )
+}
+
+function dayOfISOWeekYear(isoWeekYear, week, day) {
+  var date = new Date(0)
+  date.setUTCFullYear(isoWeekYear, 0, 4)
+  var fourthOfJanuaryDay = date.getUTCDay() || 7
+  var diff = (week - 1) * 7 + day + 1 - fourthOfJanuaryDay
+  date.setUTCDate(date.getUTCDate() + diff)
+  return date
+}
+
+// Validation functions
+
+// February is null to handle the leap year (using ||)
+var daysInMonths = [31, null, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+
+function isLeapYearIndex(year) {
+  return year % 400 === 0 || (year % 4 === 0 && year % 100)
+}
+
+function validateDate(year, month, date) {
+  return (
+    month >= 0 &&
+    month <= 11 &&
+    date >= 1 &&
+    date <= (daysInMonths[month] || (isLeapYearIndex(year) ? 29 : 28))
+  )
+}
+
+function validateDayOfYearDate(year, dayOfYear) {
+  return dayOfYear >= 1 && dayOfYear <= (isLeapYearIndex(year) ? 366 : 365)
+}
+
+function validateWeekDate(_year, week, day) {
+  return week >= 1 && week <= 53 && day >= 0 && day <= 6
+}
+
+function validateTime(hours, minutes, seconds) {
+  if (hours === 24) {
+    return minutes === 0 && seconds === 0
+  }
+
+  return (
+    seconds >= 0 &&
+    seconds < 60 &&
+    minutes >= 0 &&
+    minutes < 60 &&
+    hours >= 0 &&
+    hours < 25
+  )
+}
+
+function validateTimezone(_hours, minutes) {
+  return minutes >= 0 && minutes <= 59
+}