diff --git a/src/lib/formatDate.js b/src/lib/formatDate.ts
similarity index 78%
rename from src/lib/formatDate.js
rename to src/lib/formatDate.ts
index 844c540..477252d 100644
--- a/src/lib/formatDate.js
+++ b/src/lib/formatDate.ts
@@ -1,4 +1,4 @@
-export function formatDate(dateString) {
+export function formatDate(dateString: string) {
     return new Date(`${dateString}T00:00:00Z`).toLocaleDateString('en-IE', {
         day: 'numeric',
         month: 'long',