Updated patch attached.

Tested using:

 sudo alternatives --set ld /usr/bin/ld.bfd
 mkdir build.tmp
 cd build.tmp
 ../configure --quiet --disable-sanity-checks
 make PARALLELMFLAGS=-j$(nproc)
 make -r PARALLELMFLAGS=-j$(nproc) -C $PWD/../time objdir=$(pwd) check
 ./testrun.sh time/tst-strftime && echo ok

Note even though the code is trivial here,
%q is useful as from the shell you need to:
$(( ($(date +%-m)-1)/3+1 ))

thanks,
Pádraig.