diff --git a/server/atheneum/utility.py b/server/atheneum/utility.py
new file mode 100644
index 0000000..53f8abd
--- /dev/null
+++ b/server/atheneum/utility.py
@@ -0,0 +1,17 @@
+from datetime import date
+
+import rfc3339
+from flask.json import JSONEncoder
+
+
+class CustomJSONEncoder(JSONEncoder):
+    def default(self, obj):
+        try:
+            if isinstance(obj, date):
+                return rfc3339.format(obj)
+            iterable = iter(obj)
+        except TypeError:
+            pass
+        else:
+            return list(iterable)
+        return JSONEncoder.default(self, obj)