Mysql 5.7 from mysql
$ /usr/local/mysql-5.7.31-macos10.14-x86_64/bin/mysql --help --verbose | grep my.cnf
order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf
It works when I created /etc/my.cnf
$ cat /etc/my.cnf
[mysqld]
default_time_zone='-08:00'
Homebrew mysql
$ mysql --help --verbose | grep my.cnf
order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf /usr/local/etc/my.cnf ~/.my.cnf
/usr/local/etc/my.cnf exists
