Auth0 API doc says that the updated_at attribute for the /userinfo response should be an epoch integer. This also matches the OIDC standard claims spec. However, when actually use this endpoint, I get a datetime String response:
curl 'https://dev-g753kr1m2q1hdwiu.us.auth0.com/userinfo' \
-H "Authorization: Bearer $ACCESS_TOKEN" \
-H 'Content-Type: application/json' | jq .
{
"sub": "auth0|6650891be60ff157d437339e",
"nickname": "foobar",
"name": "foobar@foobar.com",
"picture": "https://s.gravatar.com/avatar/5d58606054103162a9739bc0ccdc7fc5?s=480&r=pg&d=https%3A%2F%2Fcdn.auth0.com%2Favatars%2Ffo.png",
"updated_at": "2024-06-23T19:05:43.257Z",
"email": "foobar@foobar.com",
"email_verified": false
}