We have a project in LA for which we are subcontractor to GC on a commercial job. Signed contract calls for Net 30 payment terms. For GC’s, this usually means at least 45-60 days. The deadline in LA is 60 days after Substantial Completion or 30 days if Notice of Substantial Completion is filed by GC/Owner. How do we know when either of these dates are reached? We don't want to miss our filing deadline.