I updated the description differently:

        Dates that contain a daylight savings time adjustment are not 24
        hours, but typically 23 or 25 hours. This change allows numeric days
        (not fixed 24-hour periods) to be added to dates which include
        a daylight savings time adjustment period. Therefore, while in
        previous releases <literal>1 day</> and <literal>24 hours</> were
        interchangeable interval values, in this release they are treated
        differently, e.g.

---------------------------------------------------------------------------

Michael Fuhr wrote:
> "dates who's result" should be "dates whose result."
> 
> -- 
> Michael Fuhr

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