A/P aging

How do people handle invoices that come in after the period has closed? Do you change the invoice date to the current period so the GL will tie to the aging? Or do you keep the invoice date as is, let it age out to the appropriate column, knowing that if you reprint an A/P aging for the prior month that it won't tie to the GL? I've been instructed by our Sage integrator that the invoice date should always match the posting date. That doesn't seem realistic nor appropriate to change an actual invoice date just to post into the current period. What does everyone else do?