go integration and wikipedia

frontend/node_modules/date-fns/isMonday.js

@@ -0,0 +1,26 @@
+"use strict";
+exports.isMonday = isMonday;
+var _index = require("./toDate.js");
+
+/**
+ * @name isMonday
+ * @category Weekday Helpers
+ * @summary Is the given date Monday?
+ *
+ * @description
+ * Is the given date Monday?
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ *
+ * @param date - The date to check
+ *
+ * @returns The date is Monday
+ *
+ * @example
+ * // Is 22 September 2014 Monday?
+ * const result = isMonday(new Date(2014, 8, 22))
+ * //=> true
+ */
+function isMonday(date) {
+  return (0, _index.toDate)(date).getDay() === 1;
+}