Indexing by date

[José M. Larre]

Hi,   I had posted this message in the forum but as I got no replies:   1)when i index, can i index only the urls of a determined date or must i index all of them independently of the date? 2) If i have to index all, can i clean after the urls of a determined date?   Is possible to index by date?   thanks in advance,   JoseML