You can now use workflows to easily change your Project Date's calendar. 

When editing your workflow, create a new "Action" step:

Next, in the dropdown select "Change Calendar":
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You can assign this step to complete automatically or have it set to "approve before changing," which allows you to confirm you want to make the change before it occurs.
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Feel free to reach out via Live Chat if you still have any remaining questions and we'll be happy to help out!
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Keywords: workflows, workflow, wf, calendar, change calendar, switch calendar, project date