时区文件目录：
$ ls /usr/share/zoneinfo/
Africa Asia Canada Cuba EST GB GMT-0
America Atlantic CET EET EST5EDT GB-Eire GMT+0
Antarctica Australia Chile Egypt Etc GMT Greenwich
Arctic Brazil CST6CDT Eire Europe GMT0 Hongkong
HST iso3166.tab Kwajalein MST NZ-CHAT posix
Iceland Israel Libya MST7MDT Pacific posixrules
Indian Jamaica MET Navajo Poland PRC
Iran Japan Mexico NZ Portugal PST8PDT
right Turkey UTC Zulu ROC UCT
WETStep2ROK Universal W-SUSingapore US zone.tab1修改时区
$ sudo ln -s /usr/share/zoneinfo/EST /etc/localtime -f保存
$ sudo hwclock --systohc