If you prefer to manually edit your configuration files, use the following syntax for this option:

weekstart       mon

The Weeks Begin On ^(weekstart) option indicates the day on which weeks are considered to begin. This is only significant when the Weekly Reports ^(weekly) option is turned on, and for aesthetic purposes in the calendar of reports.

Only the first two letters of the day of the week are required. If this option does not appear, wusage assumes that a new week begins on Sunday.