Base is not a database. Base is a tool to work with variuos types of databases. The type of database connected to your Base document is indicated in the status bar of the database main window. If you are talking about an embedded HSQLDB then all I can tell is, that there is no built-in way to calculate dates other than CURRENT_DATE. "Better" databases have a function DATEADD at least.
Which type of database are you connected to?

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