mod-localtime
%Y
2020
%Y
gmtime == gmtime
mod-localtime-indirect:
make: Unknown modifier '1'

parse-errors:
: -1 becomes Thu Jan  1 00:59:59 1970.
: space 1 becomes Thu Jan  1 01:00:01 1970.
: 0 becomes ok.
: 1 becomes Thu Jan  1 01:00:01 1970.
: INT32_MAX becomes Tue Jan 19 04:14:07 2038.
: INT32_MAX + 1 becomes Tue Jan 19 04:14:08 2038.
: overflow becomes Thu Jan  1 00:59:59 1970.
make: Unknown modifier 'e'
: letter becomes .
exit status 0