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diff --git a/date-fns/src/startOfWeekYear/index.d.ts b/date-fns/src/startOfWeekYear/index.d.ts
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+++ b/date-fns/src/startOfWeekYear/index.d.ts
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+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { startOfWeekYear } from 'date-fns'
+export default startOfWeekYear
diff --git a/date-fns/src/startOfWeekYear/index.js b/date-fns/src/startOfWeekYear/index.js
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+++ b/date-fns/src/startOfWeekYear/index.js
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+import getWeekYear from '../getWeekYear/index'
+import startOfWeek from '../startOfWeek/index'
+import toInteger from '../_lib/toInteger/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @name startOfWeekYear
+ * @category Week-Numbering Year Helpers
+ * @summary Return the start of a local week-numbering year for the given date.
+ *
+ * @description
+ * Return the start of a local week-numbering year.
+ * The exact calculation depends on the values of
+ * `options.weekStartsOn` (which is the index of the first day of the week)
+ * and `options.firstWeekContainsDate` (which is the day of January, which is always in
+ * the first week of the week-numbering year)
+ *
+ * Week numbering: https://en.wikipedia.org/wiki/Week#Week_numbering
+ *
+ * ### 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).
+ *
+ * @param {Date|Number} date - the original date
+ * @param {Object} [options] - an object with options.
+ * @param {Locale} [options.locale=defaultLocale] - the locale object. See [Locale]{@link https://date-fns.org/docs/Locale}
+ * @param {0|1|2|3|4|5|6} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
+ * @param {1|2|3|4|5|6|7} [options.firstWeekContainsDate=1] - the day of January, which is always in the first week of the year
+ * @returns {Date} the start of a week-numbering year
+ * @throws {TypeError} 1 argument required
+ * @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
+ * @throws {RangeError} `options.firstWeekContainsDate` must be between 1 and 7
+ *
+ * @example
+ * // The start of an a week-numbering year for 2 July 2005 with default settings:
+ * var result = startOfWeekYear(new Date(2005, 6, 2))
+ * //=> Sun Dec 26 2004 00:00:00
+ *
+ * @example
+ * // The start of a week-numbering year for 2 July 2005
+ * // if Monday is the first day of week
+ * // and 4 January is always in the first week of the year:
+ * var result = startOfWeekYear(new Date(2005, 6, 2), {
+ *   weekStartsOn: 1,
+ *   firstWeekContainsDate: 4
+ * })
+ * //=> Mon Jan 03 2005 00:00:00
+ */
+export default function startOfWeekYear(dirtyDate, dirtyOptions) {
+  requiredArgs(1, arguments)
+
+  var options = dirtyOptions || {}
+  var locale = options.locale
+  var localeFirstWeekContainsDate =
+    locale && locale.options && locale.options.firstWeekContainsDate
+  var defaultFirstWeekContainsDate =
+    localeFirstWeekContainsDate == null
+      ? 1
+      : toInteger(localeFirstWeekContainsDate)
+  var firstWeekContainsDate =
+    options.firstWeekContainsDate == null
+      ? defaultFirstWeekContainsDate
+      : toInteger(options.firstWeekContainsDate)
+
+  var year = getWeekYear(dirtyDate, dirtyOptions)
+  var firstWeek = new Date(0)
+  firstWeek.setFullYear(year, 0, firstWeekContainsDate)
+  firstWeek.setHours(0, 0, 0, 0)
+  var date = startOfWeek(firstWeek, dirtyOptions)
+  return date
+}
diff --git a/date-fns/src/startOfWeekYear/index.js.flow b/date-fns/src/startOfWeekYear/index.js.flow
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index 0000000..49cecb6
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+++ b/date-fns/src/startOfWeekYear/index.js.flow
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+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (
+  date: Date | number,
+  options?: {
+    locale?: Locale,
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  }
+) => Date
diff --git a/date-fns/src/startOfWeekYear/test.js b/date-fns/src/startOfWeekYear/test.js
new file mode 100644
index 0000000..c01bfa7
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+++ b/date-fns/src/startOfWeekYear/test.js
@@ -0,0 +1,83 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import startOfWeekYear from '.'
+
+describe('startOfWeekYear', function() {
+  it('returns the date with the time set to 00:00:00 and the date set to the first day of a week year', function() {
+    var result = startOfWeekYear(new Date(2005, 6 /* Jul */, 2))
+    assert.deepEqual(result, new Date(2004, 11 /* Dec */, 26, 0, 0, 0, 0))
+  })
+
+  it('accepts a timestamp', function() {
+    var result = startOfWeekYear(new Date(2005, 0 /* Jan */, 1, 6, 0).getTime())
+    assert.deepEqual(result, new Date(2004, 11 /* Dec */, 26, 0, 0, 0, 0))
+  })
+
+  it('does not mutate the original date', function() {
+    var date = new Date(2014, 6 /* Jul */, 2)
+    startOfWeekYear(date)
+    assert.deepEqual(date, new Date(2014, 6 /* Jul */, 2))
+  })
+
+  it('handles dates before 100 AD', function() {
+    var initialDate = new Date(0)
+    initialDate.setFullYear(9, 0 /* Jan */, 1)
+    initialDate.setHours(0, 0, 0, 0)
+    var expectedResult = new Date(0)
+    expectedResult.setFullYear(8, 11 /* Dec */, 28)
+    expectedResult.setHours(0, 0, 0, 0)
+    var result = startOfWeekYear(initialDate)
+    assert.deepEqual(result, expectedResult)
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    var result = startOfWeekYear(new Date(NaN))
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('allows to specify `weekStartsOn` and `firstWeekContainsDate` in locale', function() {
+    var date = new Date(2005, 6 /* Jul */, 2)
+    var result = startOfWeekYear(date, {
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 1, firstWeekContainsDate: 4 }
+      }
+    })
+    assert.deepEqual(result, new Date(2005, 0 /* Jan */, 3, 0, 0, 0, 0))
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function() {
+    var date = new Date(2005, 6 /* Jul */, 2)
+    var result = startOfWeekYear(date, {
+      weekStartsOn: 1,
+      firstWeekContainsDate: 4,
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 0, firstWeekContainsDate: 1 }
+      }
+    })
+    assert.deepEqual(result, new Date(2005, 0 /* Jan */, 3, 0, 0, 0, 0))
+  })
+
+  it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function() {
+    // $ExpectedMistake
+    var block = startOfWeekYear.bind(null, new Date(2007, 11 /* Dec */, 31), {
+      weekStartsOn: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws `RangeError` if `options.firstWeekContainsDate` is not convertable to 1, 2, ..., 7 or undefined', function() {
+    // $ExpectedMistake
+    var block = startOfWeekYear.bind(null, new Date(2007, 11 /* Dec */, 31), {
+      firstWeekContainsDate: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(startOfWeekYear.bind(null), TypeError)
+  })
+})