Magento generate order number before save

Question

the default format of the order number in magento is "100000001", but i need to generate my self the number of the order, to a get diferent format and can use it before save the order in some validations of the payment method, so, how can i generate the order number and then save it with the orther in the DB?? thanks

Answer 1

Here is good article http://bit.ly/cm4DYk