You should always use <X> if you define the dateformula string using AL

[Arthurvdv]

You should always use if you define the dateformula string using AL as otherwise it will be interpreted using the user's local setup (language). With <> the D will always be a day etc. as it will use english definition.

By @TKapitan, source: https://www.linkedin.com/posts/orlando-mantilla-037aa4123_businesscentral-dynamics365businesscentral-activity-7187095856620216322-cJFA