Laura - We have a number of calendars for each time zone, mostly (time zone calendars). Some of our calendars are for a specific team (team calendars), like the Finance team - they don’t work on projects on Fridays or the first week of the month, or in December or January. We gave them their own calendar, which we associate with the users on that Team. We mostly have time zone calendars and a few team calendars. What we do to create a project specific calendar is: 1) We take an existing Time zone calendar and copy it; 2) We put in the project specific work dates, etc.; 3) We associate that calendar with the project; Keep in mind that the calendar is used to calculate dates ONLY when there are no users assigned to the task OR when multiple users are assigned to the task. We have the Setup-Project Preferences-Timelines setting set thusly: [cid:image002.jpg@01D235BA.02B23BB0] We try to assign multiple users to every task, so that it doesn’t use the calendar of the user, it uses the Project-specific calendar we built and assigned to the project. Frequently, we just assign the PM with zero assigned hours to the task to force it to use the project-specific calendar. This is how we work within the boundaries and capabilities of timeline calculation and calendars. I found that WorkFront uses one and only one calendar at a time: 1) If you do not specific a calendar on the project, there is a system default calendar it uses for date calculations; 2) If you specific a calendar in the project setup, it uses that calendar to calculate the timeline for all tasks that have no user assigned; 3) If you assign a single user to a task, it uses the calendar assigned to that user. If the user has no calendar assigned, it uses the project calendar. Keep in mind it also factors in Time Off that user might have declared elsewhere; 4) it looks at your Setup-Project Preferences-Timelines Multiple User setting (see above) to know whether to use the calendar of the primary assignment or the project calendar; At no time does WorkFront merge calendar data. Ideally, we would be able to: 1) Make exceptions to the project calendar; 2) On a project by project basis, override the individual calendars and force all dates to use the project calendar; Does this help? Thanks, Eric