by default, the NonworkingHours property is 0, that indicates all hours in a day are working hours. The non-working hours are shown using the NonworkingHoursPattern and the NonworkingHoursColor which defines the pattern and the color, when the base level of the chart displays hours, if the ShowNonworkingUnits property is True ( by default ).  Use the ShowNonworkingUnits property to show or hide the non-working units as hours or days in your chart. Use the ItemNonworkingUnits property to specify different non-working zones for different items. Use ItemBar(exBarWorkingUnits) or ItemBar(exBarWorkingUnitsAsString) property to retrieve the working parts of the bar. Use ItemBar(exBarNonWorkingUnits) or ItemBar(exBarNonWorkingUnitsAsString) property to retrieve the non-working parts of the bar. Use the UnitWidthNonworking property to specify a different width for non-working units in the base level. Use the ShowNonworkingUnits property to hide the non-working units. The IsNonworkingDate property indicates whether the giving date-time is a working or non-working unit. You can use the ShowNonworkingHours property to show or hide the non-working hours while the NonworkingHours property is set, UnitScale is exDay ( and Level.Count property is 1 ), exHour, exMinute and exSecond.

The control supports the following ways of specify the non-working parts for items:

• NonworkingDays and NonworkingHours properties indicate the nonworking parts of the chart being applied to all items with the exception of those that use the ItemNonworkingUnits property.
• AddNonworkingDate method adds custom dates as being nonworking date which is applied to all items with the exception of those that use the ItemNonworkingUnits property.
• ItemNonworkingUnits property defines the repetitive expression to specify the non-working parts in the item.
• ItemBar( exBarTreatAsNonworking) indicates whether the bar defines actually the non-working part of the item in addition to ItemNonworkingUnits property ( which is required also )

You can select the non-working hours in the following table ( In Internet Explorer, you have to allow running the script on this page ).

24 Hour	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
AM/PM	11PM	10PM	9PM	8PM	7PM	6PM	5PM	4PM	3PM	2PM	1PM	12AM	11AM	10AM	9AM	8AM	7AM	6AM	5AM	4AM	3AM	2AM	1AM	12PM
Value	8388608	4194304	2097152	1048576	524288	262144	131072	65536	32768	16384	8192	4096	2048	1024	512	256	128	64	32	16	8	4	2	1
Bit

Click the Bit row for non-working hours and the value for property is: , (hexa), (octal), (binary)

Every bit from the less significant bit, in the NonworkingHours property specifies whether the hour is a not-working or working hour. For instance, if you want to highlight that only 9AM is a not-working hour, you should set the 10th bit in the property on 1 ( the hours starts from 0 to 23 ), and so the value for the NonworkingHours property is 512 ( which binary representation is 1000000000 ). The hours in the property starts from 0AM for the first less significant bit, 1AM for the second bit, like in the following table. 

For instance, if you need the representation of non-working hours from 6PM to 8AM, you need to set on 1 each representative bit in the NonworkingHours property, or to add corresponding values in the last row in the table for each non-working hours, so in this case the  NonworkingHours property is 16253183 or in binary 111110000000000011111111. For instance, if  the NonworkingHours property is 0 or  NonworkingHoursPattern is exPatternEmpty the not-working hours are not highlighted. Use the NonworkingDays property to specify non-working days. Use the Add("A:B") to add a bar that displays the bar A in the working area, and B in non-working areas.

The following function gets the value for the Chart.NonworkingHours property, giving start and end day shift hours:

Public Function getNonworkingHours(ByVal startTime As Date, ByVal endTime As Date) As Long
    Dim nNonworkingHours As Long, d As Double, n As Long, i As Long, dHour As Double, dSec As Double
    nNonworkingHours = 0
    dHour = 1 / 24
    dSec = dHour / 60 / 60
    d = 0
    n = 1
    For i = 1 To 24
        If (((d < startTime) And (Abs(d - startTime) > dSec)) Or ((d > endTime) And (Abs(d - endTime) > dSec))) Then
            nNonworkingHours = nNonworkingHours + n
        End If
        n = n * 2
        d = d + dHour
    Next
    getNonworkingHours = nNonworkingHours
End Function

The getNonworkingHours function, takes the start / end time ( values between 0 and 1 ), and returns the value to specify for the Chart.NonworkingHours property. For instance, the G2antt1.Chart.NonworkingHours = getNonworkingHours(#6:00:00 AM#, #6:00:00 PM#) specifies working hours between 06:00 AM and 06:00 PM (inclusive).