It would be very helpful to have every day of the week available as a choice for the start of a work week.  In fact, it would be even MORE helpful if we could select a different work week per Customer.

For instance, for one client, I invoice weekly: Friday through Thursday (so the first day of that work week, as far as Zoho is concerned, is Friday).  For another client, I invoice monthly, and would keep the traditional M-F work week.