MySQL user reject by date

[Cristophe DECOR]

Hi,
can i reject (and how ?) a demand by date (it's too late or too early to 
connect) with
Mysql users (in raddcheck table) and of course where can i store these two
fields (date_begin and date_end) in mysql radius database (new table ?, 
new field ?)
thanks

-- 
Cristophe DECOR
Montpellier Supagro
Unité Informatique
Réseau LAN
2 place VIALA
34060 MONTPELLIER
Tel : 0499612797