Datamapper csv add a column with today's date

Is it possible to add a column with today’s date to my csv file ? (on every line)

Do you actually want to add it to the CSV file or do you simply want to extract today’s date in the DataMapper? In the latter case, all you have to do is add a new field of type Date to your data model and use the JavaScript expression new Date(); to extract it.

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Phil
I want to add it to my csv file

As I posted years ago in this reply, you can do that using a preprocessing script.