Default [Q] 4.4 Kitkat profiles

Hi,

I just upgraded my I9000 to Mackay Kernel with Kitkat 4.4.
Under settings there are options for profiles, default, home, night, silent, work and custom.

For me its not sure if this is new in Kitkat, or an option from the Mackay kernel.
It looks great, But for me its not sure how to switch. Can I switch using conditions like time of day ?

Best regards,
Gert