You let him enter the invoice date as August 20, 2014, because I'll get invoice by invoice date when I cannot exceed 8 days due to the need to have a process that must be clear.
You let him enter the invoice was dated August 20, 2557 because I will be on the invoice date of the invoice by no later than 8 days because I need to have a process that needs to be cleared again.
You let him put a date on the invoice contrary 20 August 2557 because I get invoice by day in invoice when I must not exceed 8 days. Due to the process to handle.