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diff --git a/date-fns/src/_lib/setUTCISODay/index.js b/date-fns/src/_lib/setUTCISODay/index.js
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+++ b/date-fns/src/_lib/setUTCISODay/index.js
@@ -0,0 +1,27 @@
+import toInteger from '../toInteger/index'
+import toDate from '../../toDate/index'
+import requiredArgs from '../requiredArgs/index'
+
+// This function will be a part of public API when UTC function will be implemented.
+// See issue: https://github.com/date-fns/date-fns/issues/376
+export default function setUTCISODay(dirtyDate, dirtyDay) {
+  requiredArgs(2, arguments)
+
+  var day = toInteger(dirtyDay)
+
+  if (day % 7 === 0) {
+    day = day - 7
+  }
+
+  var weekStartsOn = 1
+  var date = toDate(dirtyDate)
+  var currentDay = date.getUTCDay()
+
+  var remainder = day % 7
+  var dayIndex = (remainder + 7) % 7
+
+  var diff = (dayIndex < weekStartsOn ? 7 : 0) + day - currentDay
+
+  date.setUTCDate(date.getUTCDate() + diff)
+  return date
+}
diff --git a/date-fns/src/_lib/setUTCISODay/test.js b/date-fns/src/_lib/setUTCISODay/test.js
new file mode 100644
index 0000000..11b6019
--- /dev/null
+++ b/date-fns/src/_lib/setUTCISODay/test.js
@@ -0,0 +1,79 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import setUTCISODay from '.'
+
+describe('setUTCISODay', function () {
+  it('sets the day of the ISO week', function () {
+    var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), 3)
+    assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 3)))
+  })
+
+  it('sets the day to Sunday of this ISO week if the index is 7', function () {
+    var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), 7)
+    assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 7)))
+  })
+
+  describe('the day index is more than 7', function () {
+    it('sets the day of the next ISO week', function () {
+      var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), 8)
+      assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 8)))
+    })
+
+    it('sets the day of another ISO week in the future', function () {
+      var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), 21)
+      assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 21)))
+    })
+  })
+
+  describe('the day index is less than 1', function () {
+    it('sets the day of the last ISO week', function () {
+      var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), 0)
+      assert.deepEqual(result, new Date(Date.UTC(2014, 7 /* Aug */, 31)))
+    })
+
+    it('set the day of another ISO week in the past', function () {
+      var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), -13)
+      assert.deepEqual(result, new Date(Date.UTC(2014, 7 /* Aug */, 18)))
+    })
+  })
+
+  it('accepts a timestamp', function () {
+    var result = setUTCISODay(
+      new Date(Date.UTC(2014, 8 /* Sep */, 1)).getTime(),
+      3
+    )
+    assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 3)))
+  })
+
+  it('converts a fractional number to an integer', function () {
+    var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), 3.33)
+    assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 3)))
+  })
+
+  it('implicitly converts number arguments', function () {
+    var result = setUTCISODay(new Date(Date.UTC(2014, 8 /* Sep */, 1)), '3')
+    assert.deepEqual(result, new Date(Date.UTC(2014, 8 /* Sep */, 3)))
+  })
+
+  it('does not mutate the original date', function () {
+    var date = new Date(Date.UTC(2014, 8 /* Sep */, 1))
+    setUTCISODay(date, 3)
+    assert.deepEqual(date, new Date(Date.UTC(2014, 8 /* Sep */, 1)))
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function () {
+    var result = setUTCISODay(new Date(NaN), 3)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if the given amount is NaN', function () {
+    var result = setUTCISODay(new Date(2014, 8 /* Sep */, 1), NaN)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function () {
+    assert.throws(setUTCISODay.bind(null, 1), TypeError)
+  })
+})