Using Standard variables in Bex

Hi,

     I installed from BI content the variable 0CYEAR ( current year ), and I added the infoObject 0CALDAY to my InfoProvider but I can only access to this variable for the characteristic 0CALDAY and not the other Characteristics with type 'date' like (created on, modified on ...).

How can I make this variable general in my infoProvider?

Best Regards,