Invoice Due Date

Can we please add a Due Date feature for invoices please.
I integrate with Xero and it constantly reads overdue on every invoice as the due date is the same day instead of being able to have an option for 30 days.
A Due Date will also be beneficial for clients who we allow to have a monthly account with us.
It gets a little confusing at times when we inform clients they have one month to pay but they then receive the bill and it has no due date on it.

Until then keep up the great work and we are loving your system

Thank you
Sustainable Motion