Only support timezone start with prefix GMT ?

[SingKS8]

version about my project spring boot 2.6.10 shardingsphere 5.1.2 mysql 8.0

DB configuration

spring:
  shardingsphere:
    datasource:
      names: ds
      ds:
        type: com.zaxxer.hikari.HikariDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        jdbc-url: jdbc:mysql://x.x.x.x:3306/data_demo?serverTimezone=UTC%2B8&characterEncoding=utf-8&useUnicode=yes&autoReconnect=true&useSSL=false
       

When the timezone in jdbc url is UTC+8, shardingsphere will ignore it, all timestamp persisted in db are UTC time, so I test this jdbc url with other jpa or mybatis project without shardingsphere all timestamp of them are UTC+8, if serverTimezone is GMT+8, timestamp persisted in db are GMT+8. I know most of time GMT and UTC are the same, but it will be annoying when updating some features for old project, cause most of them are using UTC way.