It may be better to use the same timezone which a majority of your users are located in, or that you live in to make log file timestamps more sensible.
Debian / Ubuntu
[bash]dpkg-reconfigure tzdata[/bash]
Arch Linux and CentOS 7
View the list of available time zones.
[bash]timedatectl list-timezones[/bash]
Use the Up, Down, Page Up and Page Down keys to navigate. Find the time zone which you want. Remember it, write it down or copy it as a mouse selection. Then press q to exit the list.
To set the time zone:
[bash]timedatectl set-timezone ‘America/New_York'[/bash]
Gentoo
View the list of available time zones.
[bash]ls /usr/share/zoneinfo[/bash]
Write the selected time zone to the /etc/timezone file.
Example (for Eastern Standard Time):
[bash]echo "EST" > /etc/timezone[/bash]
Configure the sys-libs/timezone-data package, which will set /etc/localtimeappropriately.
[bash]emerge –config sys-libs/timezone-data[/bash]
Check the Time
View the current date and time according to your server.
[bash]date[/bash]
The output should look similar to: Thu Feb 16 12:17:52 EST 2012.
转载自：https://www.linode.com/docs/getting-started/