property Calendar.NonworkingDaysForeColor as Color
Retrieves or sets a value that indicates the foreground color for non-working days.

TypeDescription
Color A Color expression that specifies the color to show the non-working days of the month.
By default, the NonworkingDaysForeColor property is black. The NonworkingDaysForeColor property specifies the foreground color for non-working days. The NonworkingDaysColor property specifies the color to show the pattern for non-working days. Use the NonworkingDays property to specify the nonworking days in a week. The FirstDay property specifies the first day of the week. Use the NonworkingDaysPattern property to specify the pattern to fill the non-working days. Use the NonMonthDaysColor property to specify the color to show days that are not owned by displayed month. By default, the ForeColor property specifies the color to show the days.

The following screen shot shows the non-working days in red: