diff --git a/spkrepo/views/admin.py b/spkrepo/views/admin.py
index f97fea5..d4af9b9 100644
--- a/spkrepo/views/admin.py
+++ b/spkrepo/views/admin.py
@@ -44,6 +44,12 @@ def is_accessible(self):
     # View
     column_list = ("username", "email", "roles", "active", "confirmed_at")
 
+    column_formatters = {
+        "confirmed_at": lambda v, c, m, p: (
+            m.confirmed_at.strftime("%Y-%m-%d %H:%M:%S") if m.confirmed_at else None
+        )
+    }
+
     # Form
     form_columns = ("username", "roles", "active")
     form_overrides = {"password": PasswordField}