In different countries, the starting day of a week can be different. For example, in United States, Sunday is the official starting day of a week. However, Monday is considered to be the first day of the week for business and social calendars in the United Kingdom, Canada, Australia, most of Europe and parts of Asia. If you want to set your starting day of a week which is used in reporting, you can do so with the following steps. 

1. Go to Profile & Settings >> User Information

2. Find option Start Week On. Select either Sunday, Monday or Saturday. Then click Save Changes (Figure 1). 

 Figure 1 

3. Once this is set, when reports are generated based on weekly time frame, the set start day will take effect.