Hi there,
Welcome to the Atlassian Community! I hope it's alright if I answer in English 🙂
Could you please elaborate on where you'd like to add those dates?
If you're using the Trello Calendar view, I should mention that only those due dates that you add manually will show up in the view as separate cards. There isn't currently a way to set up the calendar to add customized days off.
Here's some more information about the Calendar view works: https://support.atlassian.com/trello/docs/calendar-view/
Let me know if this information helps!
Alina | The Trello Team
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