Have a look at this site by Gino Scheppers. Gino created a generic time dimension framework that can be implemented in a BusinessObjects universe, aptly named the Ultimate Generic Date/Time Framework.
If you're using a recent version of BusinessObjects and Web Intelligence as a frontend, the TimeDim() function may also be of use to you. From the user guide:
The TimeDim time dimension allows you to build a time axis from a date
type universe object. TimeDim returns the data for the dates given as
the first parameter over the time periods given as the second
parameter.
Have a look at this site by Gino Scheppers. Gino created a generic time dimension framework that can be implemented in a BusinessObjects universe, aptly named the Ultimate Generic Date/Time Framework.
If you're using a recent version of BusinessObjects and Web Intelligence as a frontend, the
TimeDim()function may also be of use to you. From the user guide: