Calendars tab
Gantt Chart Calendars
By default, a newly created Gantt chart uses the main chart calendar defined by an admin, as described here: Company-wide configuration.
If needed, the main chart calendar can be edited in the chart configuration under the Calendars tab.
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In addition to the main chart calendar, a chart manager can add resource calendars by clicking the Add chart calendar button.
If the selected resource [1] has a configured personal calendar “My Calendar“, it will be used as the base calendar [2].
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If needed, the chart manager can change inherited working days or hours, or add new overrides.
Inherited overrides are shown in blue and cannot be edited.
To save a resource calendar:
Click OK in the Resource Calendar dialog.
Then click Save in the Calendars tab of the chart configuration.
If working days or working hours are left unchecked in a Gantt chart’s resource calendar, they reflect the most recent changes made by the user in their personal calendar.
Overrides defined in a user’s personal calendar are always reflected in the Gantt chart’s resource calendar, regardless of whether the override checkbox is checked in the resource calendar.
If overrides are added in the Gantt chart’s resource calendar (for working or non-working days), they are preserved in addition to any overrides made by the user in their personal calendar.
Setting a Resource’s Non-Working Day as a Working Day in the Chart Calendar
If a day is marked as a non-working day in a resource’s personal calendar but needs to be treated as a working day in the chart calendar, the chart manager can create a working day override for that date.
Example:
A resource marks September 8, 2025 as a non-working day in their personal calendar.
When creating a new chart calendar for this resource, the chart manager can add an override for September 8, 2025 to set it as a working day in the chart.
Result:
Any tasks assigned to the resource on September 8, 2025, will now have their work effort counted for that day because the chart calendar override designates it as a working day
A chart manager cannot:
Edit a private resource calendar used as the base for the chart’s resource calendar.
Create two chart calendars for the same resource.
Create a chart calendar without selecting a resource.
Chart Task Work Scheduling with or without Resource Calendars
If a task in the chart is assigned to a resource that has a defined resource calendar in the chart configuration, the task work is scheduled according to that resource calendar’s working days, hours, and overrides.
If a task is unassigned or assigned to a resource without a defined resource calendar, the task work is scheduled based on the main chart calendar (working days, hours, and overrides).
In the chart configuration, under the Calendars tab, a chart manager can also manage global calendars in addition to configuring resource calendars.
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