Improve week logic

1 files changed, 9 insertions, 0 deletions

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();
+}