Hello

I want to sort the product in the store cataloge from the newset to oldest , is there any way to do that from store setting or by code ?

Regards

I didn't install the store with it's source code? how to do that then ? 

I need to sort by Date Enterd ? I enterd data from 1 month and when I enter new I suppos to see the new one comes first

Version 2.1.0 is the last official release. I don’t remember if this version has the futures mentioned above because I am using modified RC for a looong time :)
The Catalog module is able to show added products in "New products" section. I hope you know this future, otherwise you should read at least the pinned post in this forum.
If you need to sort by date in the “Products in category” section, some code changes are necessary. The easiest way to achieve this behavior is the modification of stored procedure Store_Products_GetProducts – search in your database.