pt-query-digest log_timestamps = SYSTEM # No events processed

default --> log_timestamps = UTC

/usr/local/mysql-5.7.21/bin/mysqld, Version: 5.7.21-log (MySQL Community Server (GPL)). started with:
Tcp port: 5721 Unix socket: /tmp/mysql5721.sock
Time Id Command Argument
2018-06-26T14:27:28.337313Z 8 Connect [email protected] on using TCP/IP
2018-06-26T14:27:28.337556Z 8 Query set autocommit=0
2018-06-26T14:27:28.337915Z 8 Query set autocommit=1
2018-06-26T14:27:28.338096Z 8 Query show global status like 'Threads_connected'
2018-06-26T14:27:28.340302Z 8 Quit
2018-06-26T14:27:28.407973Z 9 Connect [email protected] on using TCP/IP
2018-06-26T14:27:28.408263Z 9 Query set autocommit=0
2018-06-26T14:27:28.408600Z 9 Query set autocommit=1
2018-06-26T14:27:28.408803Z 9 Query show global status like 'Com\_%'
2018-06-26T14:27:28.411209Z 9 Query show global status like 'Qcache_hits'
2018-06-26T14:27:28.413957Z 9 Quit

after --> log_timestamps = SYSTEM

/usr/local/mysql-5.7.21/bin/mysqld, Version: 5.7.21-log (MySQL Community Server (GPL)). started with:
Tcp port: 5721 Unix socket: /tmp/mysql5721.sock
Time Id Command Argument
2018-06-26T22:25:04.564339+08:00 1029727 Quit
2018-06-26T22:25:10.986467+08:00 1029730 Connect [email protected] on using TCP/IP
2018-06-26T22:25:10.986724+08:00 1029730 Query set autocommit=0
2018-06-26T22:25:10.987120+08:00 1029730 Query set autocommit=1
2018-06-26T22:25:10.987284+08:00 1029730 Query show global status like 'Threads_connected'
2018-06-26T22:25:10.989675+08:00 1029730 Quit
2018-06-26T22:25:11.056126+08:00 1029731 Connect [email protected] on using TCP/IP
2018-06-26T22:25:11.056878+08:00 1029731 Query set autocommit=0
2018-06-26T22:25:11.057106+08:00 1029731 Query set autocommit=1
2018-06-26T22:25:11.057267+08:00 1029731 Query show global status like 'Com\_%'
2018-06-26T22:25:11.059806+08:00 1029731 Query show global status like 'Qcache_hits'
2018-06-26T22:25:11.062095+08:00 1029731 Quit