It appears you have a well-structured Git repository with various files, including SVG icons and HTML documents. Here's a brief overview:

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

@@ -0,0 +1,36 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = differenceInQuarters;
+var _index = _interopRequireDefault(require("../differenceInMonths/index.js"));
+var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+var _index3 = require("../_lib/roundingMethods/index.js");
+/**
+ * @name differenceInQuarters
+ * @category Quarter Helpers
+ * @summary Get the number of quarters between the given dates.
+ *
+ * @description
+ * Get the number of quarters between the given dates.
+ *
+ * @param {Date|Number} dateLeft - the later date
+ * @param {Date|Number} dateRight - the earlier date
+ * @param {Object} [options] - an object with options.
+ * @param {String} [options.roundingMethod='trunc'] - a rounding method (`ceil`, `floor`, `round` or `trunc`)
+ * @returns {Number} the number of full quarters
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // How many full quarters are between 31 December 2013 and 2 July 2014?
+ * const result = differenceInQuarters(new Date(2014, 6, 2), new Date(2013, 11, 31))
+ * //=> 2
+ */
+function differenceInQuarters(dateLeft, dateRight, options) {
+  (0, _index2.default)(2, arguments);
+  var diff = (0, _index.default)(dateLeft, dateRight) / 3;
+  return (0, _index3.getRoundingMethod)(options === null || options === void 0 ? void 0 : options.roundingMethod)(diff);
+}
+module.exports = exports.default;