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There is a setting in the tps.config which changes the first day of the week. However I've just tested this and I can't see that this change is reflected when using a weekly date grouping within a query. Could you please raise this as a support case via the support portal and we will get this passed to the Development team? Please reference this thread.
I've thought of a couple of things that could be considered as a temporary workaround until this is corrected, but it depends on which would suit your requirement which route we could take. We can discuss this with you in the support case and update the thread afterwards with the outcome.
Just to confirm that this has been raised as problem 4810.