295cf322b1
Old git versions (like the one shipped in Debian 8) do not support setting date format with --date, working this around by processing git log output with date +%Y. * main/update_copyright_years.sh (process_file) <first_commit_year, last_commit_year>: Change format to format:%aD, remove --date, supply output as a -d option argument to date +%Y.