The following monthly project calendar defines the working, non-working days, and times for tasks. As suggested here in the diagram, this calendar usually represents an organization's traditional working hours. The project calendar defines the working and non-working days and times for tasks. This calendar usually represents your organization's traditional working hours. The project uses this calendar to schedule tasks that do not have resources assigned or that have a task type of fixed duration. The below project calendar template is highly customizable and can be exported in any format as required. Use EdrawMax or EdrawMax Online to create a free project calendar for your project.