It is because I am using a php script that I load the articles to it once a month and then it schedules them every tuesday, thursday and sunday starting from the last upload date. So, If I add them now, they will start from the current date of the server... even if i change the upload date, in myphpadmin, the next batch will go from the scheduled date not from the one I modified.
I am thinking of renting a virtual server (VPS). I heard you can change the date on some of them. I can build the database there and then import it to my current server.