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A general description is here.
Similarly, the ‘as.character.hexmode()’ and ‘*.octmode()’ methods also behave as ‘good citizen’ methods and back compatibility option ‘keepStr = TRUE’.
‘as.character(<POSIXt>)’ now behaves more in line with the methods for atomic vectors such as numbers, and is no longer influenced by ‘options()’. Ditto for ‘as.character(<Date>)’. Use of ‘as.character(*, format = .)’ now warns.
Non-finite ‘POSIXlt’ now correctly coerce to ‘Date’; following up on the extension to ‘format()’ them correctly.