move date to polyfill

client/js/api.js

@@ -1,6 +1,5 @@
 'use strict';
 
-require('./util/date.js');
 const cookies = require('js-cookie');
 const request = require('superagent');
 const config = require('./config.js');

client/js/util/date.js

@@ -1,7 +0,0 @@
-'use strict';
-
-Date.prototype.addDays = function(days) {
-    let dat = new Date(this.valueOf());
-    dat.setDate(dat.getDate() + days);
-    return dat;
-};

client/js/util/polyfill.js

@@ -59,3 +59,10 @@ Number.prototype.between = function(a, b, inclusive) {
 
 // non standard
 Promise.prototype.abort = () => {};
+
+// non standard
+Date.prototype.addDays = function(days) {
+    let dat = new Date(this.valueOf());
+    dat.setDate(dat.getDate() + days);
+    return dat;
+};