If you are in a field that requires you to select a weekly period, you can easily select the required week in this view of the Calendar window.In the Calendar window, the date in the red box is the current date and the date in the blue box is the first day of the selected week.note : If you use this window to select weeks for entering timesheets, you can specify the first day of the week in the System view of the Preferences window.Blue boxA date in a blue box indicates the first day of the selected week to be entered in the Week of field.