CDO

hi all,
I need to calculate a running mean on a climatology, i.e. an daily annual cycle that is itself a multiyear mean. I need data for every day of the year, and the moving window needs to cross start/end year, for example the window around 1st of January should range between e.g. 29 december and 3 january (if the window width is 5 days).
Is there an option to do this automatically in CDO? i searched and searched but found nothing.

Thanks in advance!
Tom