public TimeIntervalCollection WorkIntervals { get; }

Public ReadOnly Property WorkIntervals As TimeIntervalCollection

<dxc:XYDiagram2D.AxisX>
    <dxc:AxisX2D>
        <dxc:AxisX2D.DateTimeScaleOptions>
            <!-- Enable the feature to show only working time on the date-time x-axis. -->
            <dxc:ManualDateTimeScaleOptions WorkTimeOnly="True"
                                            AutoGrid="False"                              
                                            MeasureUnit="Hour" 
                                            GridAlignment="Hour">
                <dxc:ManualDateTimeScaleOptions.WorkTimeRules>
                    <!-- Add a work time rule. -->
                    <!-- Specify weekdays on which this rule should be applied. -->
                    <dxc:WorkTimeRule Weekdays="Monday,Tuesday,Wednesday,Thursday,Friday">
                        <dxc:WorkTimeRule.WorkIntervals>
                            <!-- Specify one or more working time intervals of this rule. -->
                            <dxc:TimeInterval StartHour="09"
                                              StartMinute="00"
                                              StartSecond="00"
                                              EndHour="18"
                                              EndMinute="00"
                                              EndSecond="00"/>
                        </dxc:WorkTimeRule.WorkIntervals>
                    </dxc:WorkTimeRule>
                    <!-- Add one more work time rule. -->
                    <!-- Specify the date to which the rule is applied. -->
                    <dxc:WorkTimeRule Date="02/02/17">
                        <dxc:WorkTimeRule.WorkIntervals>
                            <!-- A time interval can be set as follows. -->
                            <dxc:TimeInterval>9:00:00-18:00:00</dxc:TimeInterval>
                        </dxc:WorkTimeRule.WorkIntervals>
                    </dxc:WorkTimeRule>
                </dxc:ManualDateTimeScaleOptions.WorkTimeRules>
            </dxc:ManualDateTimeScaleOptions>
        </dxc:AxisX2D.DateTimeScaleOptions>
        <!--...-->
    </dxc:AxisX2D>
</dxc:XYDiagram2D.AxisX>