Calendars exist for projects and tasks in the following areas:
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• Global project calendar (click the calendar toggle on the projects view):

• Global task calendar (click the calendar toggle on the tasks view):

• Project calendar (click the 'task calendar' tab within a project):

You can control the calendar frequency for global project and global task calendars by clicking here and selecting month, week, or day:
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You can also apply filters to these calendars by clicking here:

and making appropriate selections; here we have filtered to show only the flyer projects: