1 files changed, 9 insertions, 0 deletions
diff --git a/src/client/react/lib/purifyWeek.js b/src/client/react/lib/purifyWeek.js
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+++ b/src/client/react/lib/purifyWeek.js
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+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();
+}