Hello How can I set the definition of a week in my Time dimension in SSAS? Now it starts on Monday ends on Sunday. The week must start on Sunday and end on Saturday. I know there is an option when creating new one BUT Do I need to create new one or is it possible to change it in current Time dimension?
As mentioned in the comment, when creating the Time dimension if you had specified a source system to create the table to then that table could be updated manually.
In either case it would likely be easier to drop and re-create the table. As the business key column is the stripped down date field, provided that column is referenced in your fact tables, this should be streamlined in re-processing.