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‘trunc(<Date>, *)’ now reacts to ‘units = "months"’ or ‘"years"’ in consistency with the ‘POSIXt’ method, thanks to Dirk Eddelbuettel's proposal in PR#18099.
Not strictly fixing a bug, ‘format()’ing and ‘print()’ing of non-finite ‘Date’ and ‘POSIXt’ values ‘NaN’ and +/-‘Inf’ no longer show as ‘NA’ but the respective string, e.g., ‘Inf’, in consistency with numeric vector's behaviour, fulfilling the wish of PR#18308.