Table of Contents
NTP Local Time Zone
Preface
All NTP servers are providing the time in GMT / UTC format. According to this it’s up to NTP Client to present the OS time in local time zone.
In some cases it is mostly recommended to use GMT / UTC time. For example in large international company. In the case that this company has servers in EMEA, AMS and APAC region it is any time really confusing when each server is using different time. For example if someone is investigating an issue, it's just wasted time that he need to spend when he is comparing logs from different time zones.
Change Local Time Zone
Zone Information File
Please check the “/usr/share/zoneinfo/” directory as here are stored the Local Time Zone configuration files that we will need to use for Time Zone configuration update. Try to find the one that is corresponding to your location.
[root@NTP-Stratum-2 ~]# ls /usr/share/zoneinfo Africa Asia Canada Cuba EST GB GMT-0 HST iso3166.tab Kwajalein Mideast NZ Portugal PST8PDT Singapore US zone.tab America Atlantic CET EET EST5EDT GB-Eire GMT+0 Iceland Israel Libya MST NZ-CHAT posix right Turkey UTC Zulu Antarctica Australia Chile Egypt Etc GMT Greenwich Indian Jamaica MET MST7MDT Pacific posixrules ROC UCT WET Arctic Brazil CST6CDT Eire Europe GMT0 Hongkong Iran Japan Mexico Navajo Poland PRC ROK Universal W-SU
Configure your Time Zone
After you have found the right Time Zone config file you’ll copy it to “ /etc/localtime ”
[root@NTP-Stratum-2 ~]# date # Local OS time before change Tue Mar 18 14:45:16 UTC 2014 [root@NTP-Stratum-2 ~]# cp /usr/share/zoneinfo/Japan /etc/localtime # Changing of OS time config cp: overwrite `/etc/localtime'? y [root@NTP-Stratum-2 ~]# date # After changing of the time Tue Mar 18 23:45:42 JST 2014
