Postgres timestamp to human eye time string or millisecond value

Turn the string

The way 1

SELECT to_char(create_time, 'YYYY-MM-DD hh24:mi:ss') from io_batch_time where status = 6 and gb_code = '156110000' order by create_time;

Turn millisecond

The way 1

SELECT batch_name,floor(extract(epoch from create_time)*1000),create_time from io_batch_time where status = 6 and gb_code = '156110000' order by create_time;