按添加日期对文件夹中的iOS排序文件进行排序

My app downloads files from the internet. App stores them in Documents folder . App uses iTunes Sharing feature, and user can store files in Documents folder through iTunes (when my application is launched and when my app is not launched). In one of tableviews in my app I want to present files from Documents directory sorted by Date added (date, when files were added to Documents directory). Is there any file attribute like "Date Added" on iOS? How can I retrieve it? I searched for this, but I cannot found an answer for now.My app downloads files from the internet. App s