Modify the time zone of centos7

what the heck is this? The time zone is Shanghai, but why is it GMT-8,? shouldn"t it be GMT+8?
in addition, run the date command and display the same date and time as Beijing time

Mar.17,2021

CST time standard is used in China. Just copy the timezone from Shanghai

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ln-sf / usr/share/zoneinfo/Asia/Shanghai / etc/localtime CST-8

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3794b-2c0b0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3794b-2c0b0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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