Day of week incorrect on Date picker and Variables

My client was complaining that the date on the date picker and the day on the datepicker do not corrospond when prompted for a date when asking for variables on launching a report. Did not believe them until yesterday . Her datepicker runs from Monday to Sunday. @weekday@ = 2; @date@ = 25 July;@DayName@ = Tuesday. not as it should be Monday! According to to her datepicker the day of week is 2 but as it runs from Monday to Sunday not Sunday to Saterday the calendar is a day out.

 

Ideas please