[Haskell-cafe] How to work with date?

Hi,   I am working on some calendar GUI thing. And I cannot find a library to operate the "date". Like, when `now <- getZonedTime`, how could I get all the dates of the week. Or when I got `today`, how to get the date of 10 days ago? Thanks. -- 竹密岂妨流水过 山高哪阻野云飞