%F is specified by ISO C99. It adds semantic meaning as printing an ISO 8601 date. Scripted change: $ cat ~/tmp/spatch/strftime_F.sp @@ @@ - "%Y-%m-%d" + "%F" $ find contrib/ lib* src/ -type f \ | xargs spatch --sp-file ~/tmp/spatch/strftime_F.sp --in-place Signed-off-by: Alejandro Colomar <alx@kernel.org>