I am using todoist to process orders. I need to display the date when the task is added along side the task or at the least when printing a task list. Is it possible?
Unfortunately, it's not possible right now. We will consider adding such option in the future and you're welcome to vote for this suggestion in our Votebox: http://todoist.com/Vote/showProposal/155/
For now, as a workaround, you could try to use note as each task note has a timestamp or add labels with the date to each task, for example @22/01 which would also allow you to quickly search for all tasks with this label.