Source: differenceInMinutes/index.js

import differenceInMilliseconds from '../differenceInMilliseconds/index'
import requiredArgs from '../_lib/requiredArgs/index'

var MILLISECONDS_IN_MINUTE = 60000

/**
 * @name differenceInMinutes
 * @category Minute Helpers
 * @summary Get the number of minutes between the given dates.
 *
 * @description
 * Get the signed number of full (rounded towards 0) minutes between the given dates.
 *
 * ### 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} dateLeft - the later date
 * @param {Date|Number} dateRight - the earlier date
 * @returns {Number} the number of minutes
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // How many minutes are between 2 July 2014 12:07:59 and 2 July 2014 12:20:00?
 * var result = differenceInMinutes(
 *   new Date(2014, 6, 2, 12, 20, 0),
 *   new Date(2014, 6, 2, 12, 7, 59)
 * )
 * //=> 12
 *
 * @example
 * // How many minutes are from 10:01:59 to 10:00:00
 * var result = differenceInMinutes(
 *   new Date(2000, 0, 1, 10, 0, 0),
 *   new Date(2000, 0, 1, 10, 1, 59)
 * )
 * //=> -1
 */
export default function differenceInMinutes(dirtyDateLeft, dirtyDateRight) {
  requiredArgs(2, arguments)

  var diff =
    differenceInMilliseconds(dirtyDateLeft, dirtyDateRight) /
    MILLISECONDS_IN_MINUTE
  return diff > 0 ? Math.floor(diff) : Math.ceil(diff)
}