If it is you could use a nth child css selector?

If it is not always the same column, you would have to include the division(3rd line of same function) such as div#_doc_tbl_span(customer allocation) or div#_trans_tbl_span(customer transactions) to give a unique selector and change the nth child number accordingly; but its used 22 times, so possibly 22 different div# id's.

Edit: the above may affect other tables as well, so you would have to add an addition class:-

change

File: \includes\ui\db_pager_view.inc
115:                 label_cell(sql2date($cell), "align='center' nowrap"); break;

to 

File: \includes\ui\db_pager_view.inc
115:                 label_cell(sql2date($cell), "align='center' nowrap class='mystyle'"); break;

Now 'mystyle' is unique; so can be formatted how you want

Or you can you use inline styling directly to the function