I'm going to start next term's Dragon invoice within two weeks. Please send details to me within the last 18 of this month because I want to send invoice via email in the next month.
I began to draft invoice of the semester this week. Please send details to me within 18 days of this month, because I need to send the email invoice the next month.
I will begin to draft invoice of next term within a week. Please send the details to me by the 18 of this month, because I need to prepare to send invoice the email in next month.