We invoice some clients at the end of the month for all work completed that month. This is usually on a per item fee type project. I want the issue date of the invoice to be the last day of the month (not always the 30th for example), but also for the invoice to be created at the very end of the day, so that it captures any work done that day. Alternatively, invoices could be created on the 1st of the month, if we could specify that the issue date was the last day of the month.