3 files changed, 19 insertions, 9 deletions
diff --git a/src/client/react/components/container/WeekSelector.js b/src/client/react/components/container/WeekSelector.js
index c9174ca..eef8d8d 100644
--- a/src/client/react/components/container/WeekSelector.js
+++ b/src/client/react/components/container/WeekSelector.js
@@ -1,17 +1,18 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import moment from 'moment';
-import momentPropTypes from 'react-moment-proptypes';
 import queryString from 'query-string';
 import { withRouter } from 'react-router-dom';
 
+import purifyWeek from '../../lib/purifyWeek';
+
 const WeekSelector = ({ urlWeek, location, history }) => {
   const updateWeek = (change) => {
-    const newWeek = moment().week(urlWeek.week() + change);
-    const isCurrentWeek = moment().week() === newWeek.week();
+    const newWeek = purifyWeek(urlWeek + change);
+    const isCurrentWeek = moment().week() === newWeek;
 
     const query = queryString.stringify({
-      week: isCurrentWeek ? undefined : newWeek.week(),
+      week: isCurrentWeek ? undefined : newWeek,
     });
     history.push(`${location.pathname}?${query}`);
   };
@@ -19,14 +20,14 @@ const WeekSelector = ({ urlWeek, location, history }) => {
   return (
     <div>
       <button onClick={() => updateWeek(-1)}>Prev</button>
-      Week {urlWeek.week()}
+      Week {urlWeek}
       <button onClick={() => updateWeek(+1)}>Next</button>
     </div>
   );
 };
 
 WeekSelector.propTypes = {
-  urlWeek: momentPropTypes.momentObj.isRequired,
+  urlWeek: PropTypes.number.isRequired,
   history: PropTypes.shape({
     push: PropTypes.func.isRequired,
   }).isRequired,
diff --git a/src/client/react/components/page/User.js b/src/client/react/components/page/User.js
index 72e92c2..10d608d 100644
--- a/src/client/react/components/page/User.js
+++ b/src/client/react/components/page/User.js
@@ -3,6 +3,7 @@ import PropTypes from 'prop-types';
 import { Redirect } from 'react-router-dom';
 import queryString from 'query-string';
 import moment from 'moment';
+import purifyWeek from '../../lib/purifyWeek';
 import Search from '../container/Search';
 import View from '../container/View';
 import users from '../../users';
@@ -11,7 +12,7 @@ import WeekSelector from '../container/WeekSelector';
 const App = ({ match, location }) => {
   const user = `${match.params.type}/${match.params.value}`;
   const weekStr = queryString.parse(location.search).week;
-  const week = weekStr ? moment().week(weekStr) : moment();
+  const week = purifyWeek(weekStr ? parseInt(weekStr, 10) : moment().week());
 
   if (!users.allIds.includes(user)) {
     // Invalid user, redirect to index.
@@ -26,8 +27,7 @@ const App = ({ match, location }) => {
           <WeekSelector urlWeek={week} />
         </div>
       </div>
-      {/* The View object just wants the week number. */}
-      <View user={user} week={week.week()} />
+      <View user={user} week={week} />
     </div>
   );
 };
diff --git a/src/client/react/lib/purifyWeek.js b/src/client/react/lib/purifyWeek.js
new file mode 100644
index 0000000..939f5af
--- /dev/null
+++ b/src/client/react/lib/purifyWeek.js
@@ -0,0 +1,9 @@
+import moment from 'moment';
+
+export default function purifyWeek(week) {
+  // This ensures that week 0 will become week 52 and that week 53 will become
+  // week 1. This also accounts for leap years. Because date logic can be so
+  // complicated we off load it to moment.js so that we can be sure it's bug
+  // free.
+  return moment().week(week).week();
+}