public void setShowDistinctPastFutureColor(boolean showDistinctPastFutureColor) {
        this.mShowDistinctPastFutureColor = showDistinctPastFutureColor;
        invalidate();
    }
Set whether weekends should have a background color different from the normal day background
color. The past and future day colors are defined by the attributes `futureBackgroundColor`
and `pastBackgroundColor`.
@param showDistinctPastFutureColor True if past and future should have two different
                                   background colors.
library/src/main/java/com/alamkanak/weekview/WeekView.java