Under dba_objects one can see when an object (table, view, synonym, etc) was created, but how can one see when (at what time) an additional extent was allocated?

For instance, a table is created and the segment with its initial accompanying extent is allocated. That time of table creation (initial extent allocation)can be found in dba_objects. But after a while, as the table grows, an additional extent is allocated to that table to accommodate more rows. So the table now has 2 extents. But at what date (time also) was the second extent allocated? The date of first extent allocation is easy, but what of the date of the subsequent extent allocations?

Regards
Tim