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/home/byroehnu/easepay.easetack.com/node_modules/date-fns/getISOWeek/index.js

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"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getISOWeek;
var _index = _interopRequireDefault(require("../toDate/index.js"));
var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
var _index3 = _interopRequireDefault(require("../startOfISOWeekYear/index.js"));
var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
var MILLISECONDS_IN_WEEK = 604800000;

/**
 * @name getISOWeek
 * @category ISO Week Helpers
 * @summary Get the ISO week of the given date.
 *
 * @description
 * Get the ISO week of the given date.
 *
 * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
 *
 * @param {Date|Number} date - the given date
 * @returns {Number} the ISO week
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // Which week of the ISO-week numbering year is 2 January 2005?
 * const result = getISOWeek(new Date(2005, 0, 2))
 * //=> 53
 */
function getISOWeek(dirtyDate) {
  (0, _index4.default)(1, arguments);
  var date = (0, _index.default)(dirtyDate);
  var diff = (0, _index2.default)(date).getTime() - (0, _index3.default)(date).getTime();

// Round the number of days to the nearest integer
  // because the number of milliseconds in a week is not constant
  // (e.g. it's different in the week of the daylight saving time clock shift)
  return Math.round(diff / MILLISECONDS_IN_WEEK) + 1;
}
module.exports = exports.default;

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