I would like to know when I enter a new project and they ask for start date and completion date, which date am I using. Example : We supply the materials. So when the subcontractor places his order on lets say June 1st and we ship it out on June 2nd, Invoice it on June 3rd, Do I use the Invoice date as my start date ? We do not know when a job starts or ends, since we only supply the material. So do I need to issue a date at all ? Please advise . Thank you