linux - change raspberry pi date from php -

i have problem trying change date in rpi php. if write:

shell_exec('sudo date --set="15 nov 2015 12:43:10"'); 

i don't feedback, output "", if execute

shell_exec('date --set="15 nov 2015 12:43:10"'); 

i recived

15 nov 2015 12:43:10 

as output nothing change in rpi

i added www-data sudoers visudo command, , add

www-data all=(all) nopasswd: 

but didn't worked.

i've tried

chmod 777 /bin/date,  

nothing.. try make .sh file command , run , without sudo.. same result.

any idea? all!

ps.sorry english

i solved problem... after add sudo group command adduser www-data sudo , re-execute first intuitive cmd sudo date --set... runs ok!!