4 files changed, 109 insertions, 0 deletions
diff --git a/date-fns/src/millisecondsToHours/index.d.ts b/date-fns/src/millisecondsToHours/index.d.ts
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--- /dev/null
+++ b/date-fns/src/millisecondsToHours/index.d.ts
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+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { millisecondsToHours } from 'date-fns'
+export default millisecondsToHours
diff --git a/date-fns/src/millisecondsToHours/index.js.flow b/date-fns/src/millisecondsToHours/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: (milliseconds: number) => number
diff --git a/date-fns/src/millisecondsToHours/index.ts b/date-fns/src/millisecondsToHours/index.ts
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+++ b/date-fns/src/millisecondsToHours/index.ts
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+import requiredArgs from '../_lib/requiredArgs/index'
+import { millisecondsInHour } from '../constants/index'
+
+/**
+ * @name millisecondsToHours
+ * @category Conversion Helpers
+ * @summary Convert milliseconds to hours.
+ *
+ * @description
+ * Convert a number of milliseconds to a full number of hours.
+ *
+ * @param {number} milliseconds - number of milliseconds to be converted
+ *
+ * @returns {number} the number of milliseconds converted in hours
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // Convert 7200000 milliseconds to hours:
+ * const result = millisecondsToHours(7200000)
+ * //=> 2
+ *
+ * @example
+ * // It uses floor rounding:
+ * const result = millisecondsToHours(7199999)
+ * //=> 1
+ */
+export default function millisecondsToHours(milliseconds: number): number {
+  requiredArgs(1, arguments)
+  const hours = milliseconds / millisecondsInHour
+  return Math.floor(hours)
+}
diff --git a/date-fns/src/millisecondsToHours/test.ts b/date-fns/src/millisecondsToHours/test.ts
new file mode 100644
index 0000000..5fed366
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+++ b/date-fns/src/millisecondsToHours/test.ts
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+/* eslint-env mocha */
+
+import assert from 'assert'
+import millisecondsToHours from '.'
+
+describe('millisecondsToHours', function () {
+
+  it('converts milliseconds to hours', function () {
+    assert(millisecondsToHours(3600000) === 1)
+    assert(millisecondsToHours(7200000) === 2)
+  })
+
+  it('uses floor rounding', () => {
+    assert(millisecondsToHours(3600001) === 1)
+    assert(millisecondsToHours(3599999) === 0)
+  })
+
+  it('handles border values', () => {
+    assert(millisecondsToHours(3600000.5) === 1)
+    assert(millisecondsToHours(0) === 0)
+  })
+})