You can schedule invoices to automatically send out on a future date. Set it and forget it!
Scheduled invoices are sent between 10:45 AM and 11 AM US Eastern Time on the date you specify.
You can edit all fields of a scheduled invoice, including its send date, any time before 10:45 AM US Eastern Time on the scheduled date. You can also cancel the invoice to prevent it from being sent, which will not trigger an email to your customer.
Please note that canceling a scheduled invoice after it is sent will trigger an email to your customer.