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A general description is here.
Objects of class ‘"POSIXlt"’ created in thie version of R always have 11 components: component ‘zone’ is always set, and component ‘gmtoff’ is set for times in UTC and usually set on the (almost all) platforms which have C-level support.
Printing 0-length objects of class ‘"factor"’, ‘"roman"’, ‘"hexmode"’, ‘"octmode"’, ‘"person"’, ‘"bibentry"’, or ‘"citation"’ now prints something better, one of which fixes PR#18422, reported by Benjamin Feakins.
‘as.POSIXlt.Date()’ could underflow for dates in the far past (more than half a million years BCE).