Formula: Difference between 2 dates displayed as weeks and days

Formula: Difference between 2 dates displayed as weeks and days

Hi all,

Could anyone help me creating a formula that calculates the difference between the current date and another date from my form and that period of time to be displayed as xx "weeks" and y "days"? The formula field that I created so far has the following expression: 
((zoho.currentdate - Data_um)  /  (1000  *  3600  *  24  *  7)).round(2) 
but it shows me the period of time like xx.## weeks which I am not so happy with.
Is it possible to show that field in the report only if that computed value is less than let's say 41 weeks?

Thank you very much!

Kind regards,
Costin