Zinnia has one-way calendar syncing from Zinnia to your external calendar app (like Apple Calendar, Google Calendar, etc.) You can link individual calendar events to any image, text, or other object on your journal. Just tap/click the link to view the event details in your external calendar.
For instructions on how to set this up, check out this article.
If you are interested in two-way calendar sync, we suggest you vote for the feature on our Feature Request Forum. Your input directly influences new developments and we love hearing from you!
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