1 files changed, 4 insertions, 0 deletions
diff --git a/src/api/models/user.ts b/src/api/models/user.ts
index 1742f5cafb..ac59e2bfc3 100644
--- a/src/api/models/user.ts
+++ b/src/api/models/user.ts
@@ -8,3 +8,7 @@ export default collection;
 export function validateUsername(username: string): boolean {
 	return /^[a-zA-Z0-9\-]{3,20}$/.test(username);
 }
+
+export function isValidBirthday(birthday: string): boolean {
+	return /^([0-9]{4})\-([0-9]{2})-([0-9]{2})$/.test(birthday);
+}