This blog is updated daily.
A general description is here.
‘diff()’ for objects of class ‘"Date"’, ‘"POSIXct"’, and ‘"POSIXlt"’ accepts a ‘"units"’ argument passed via ‘...’.
Build-stage Rd macros \packageAuthor and \packageMaintainer now process ‘Authors@R’, fixing ‘NA’ results when the package ‘DESCRIPTION’ omits ‘Author’ and ‘Maintainer’ fields.