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backend/node_modules/date-fns/getISOWeekYear/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getISOWeekYear;
+var _index = _interopRequireDefault(require("../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name getISOWeekYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Get the ISO week-numbering year of the given date.
+ *
+ * @description
+ * Get the ISO week-numbering year of the given date,
+ * which always starts 3 days before the year's first Thursday.
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @param {Date|Number} date - the given date
+ * @returns {Number} the ISO week-numbering year
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // Which ISO-week numbering year is 2 January 2005?
+ * const result = getISOWeekYear(new Date(2005, 0, 2))
+ * //=> 2004
+ */
+function getISOWeekYear(dirtyDate) {
+  (0, _index3.default)(1, arguments);
+  var date = (0, _index.default)(dirtyDate);
+  var year = date.getFullYear();
+  var fourthOfJanuaryOfNextYear = new Date(0);
+  fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
+  fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
+  var startOfNextYear = (0, _index2.default)(fourthOfJanuaryOfNextYear);
+  var fourthOfJanuaryOfThisYear = new Date(0);
+  fourthOfJanuaryOfThisYear.setFullYear(year, 0, 4);
+  fourthOfJanuaryOfThisYear.setHours(0, 0, 0, 0);
+  var startOfThisYear = (0, _index2.default)(fourthOfJanuaryOfThisYear);
+  if (date.getTime() >= startOfNextYear.getTime()) {
+    return year + 1;
+  } else if (date.getTime() >= startOfThisYear.getTime()) {
+    return year;
+  } else {
+    return year - 1;
+  }
+}
+module.exports = exports.default;