While not directly involving the SDK, the Laserfiche Server does audit the trustee creation event so if you are still wanting to find out when a trustee was created, then as long as the "Account" audit event class is being audited and the Audit Trail date range is configured accordingly, you can query the Audit Trail database, specifically the [account_events] view. You'll want to look for [event_type]=7 and name of the trustee in the [trustee_name] column. Then you can check the [event_time] which gives you when the trustee was created. If your Audit Trail edition allows for auditing successes and failures and you are only concerned with the successful creation of a trustee, then you can also check for [succeeded]=1.