注意：修改Linux系统的时区以后，再安装jvm，jvm默认会使用系统的时区。
如果系统时区设置错误，安装jvm后，再修改系统的时区，但jvm的时区仍然用不变，除非添加jvm的启动参数：-D user.timezone=GMT+08
# timedatectl Warning: Ignoring the TZ variable. Reading the system's time zone setting only. Local time: Mon 2016-11-21 01:52:42 EST Universal time: Mon 2016-11-21 06:52:42 UTC RTC time: Mon 2016-11-21 06:52:42 Time zone: America/New_York (EST, -0500) NTP enabled: n/a NTP synchronized: no RTC in local TZ: no DST active: no Last DST change: DST ended at Sun 2016-11-06 01:59:59 EDT Sun 2016-11-06 01:00:00 EST Next DST change: DST begins (the clock jumps one hour forward) at Sun 2017-03-12 01:59:59 EST Sun 2017-03-12 03:00:00 EDT
设置时区为CST(东8区)
# timedatectl set-timezone Asia/Shanghai Warning: Ignoring the TZ variable. Reading the system's time zone setting only. Local time: Mon 2016-11-21 14:52:59 CST Universal time: Mon 2016-11-21 06:52:59 UTC RTC time: Mon 2016-11-21 06:52:59 Time zone: Asia/Shanghai (CST, +0800) NTP enabled: n/a NTP synchronized: no RTC in local TZ: no DST active: n/a [root@localhost ~]#方法2：TZ环境变量的方式
修改用户目录下的.bash_profile，在文件末尾追加：
TZ='Asia/Shanghai'; export TZ
推出登录后，重新登录，date命令可以查看效果。
