I want latex to understand that the refrece do not have a date

I am using Zotero in latex and the sources that don´t have a date i want to write n.d in Zotero. Latex seems to only understand specific date. How can i change that.

In zotero:
https://s3.amazonaws.com/zotero.org/images/forums/u13461356/juth0agg8cves16qre3l.png

In latex:
https://s3.amazonaws.com/zotero.org/images/forums/u13461356/5d6sajc9hkuy821w49fw.png
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