How can I get the number of week (of quarter) in a Date in sap hana modeling?

Hi,

I need to calculate number of week of quarter for a given date in sap hana graphical modeling.

for example: the given input is year - 2015 quarter - Q2 and I have a column in my cal. view as 20.08.2015.

Now I should a get the week number of quarter Q2 of year 2015 for 20.08.2015 is : 8.

Can anyone suggest me the logic to be implemented to calculate the above logic.

Thanks in advance.

Regards,

Ramana SBLSV.