Postfix Logfile

[Schwalbe, Oliver]

Hi there,
 
 
i have a little problem to change time of logswitch for the postfix-logfile 
mail in /var/log/.
the logswitch yet is every day at 11:00 am. The switch should take place at 
midnight. 
i can't find any parameter in main.cf or master.cf
 
Kind regards
 
Oliver