My CentOS server is not updating showing correct time. I have set $ ln -sf /usr/share/zoneinfo/Europe/London  /etc/localtimeStill I am on GMT. I do see the following entries in /etc/sysconfig/clock:$cat /etc/sysconfig/clockZONE=Europe/LondonUTC=trueARC=falseStill it is not showing correct time. NTP is running on this server:$ ntpq -premote           refid      st t when poll reach   delay   offset  jitter+         IP Address      3 u   42 1024  377    0.476   63.077   0.001*         IP Address      3 u   53 1024  377    1.183   30.425   0.001The ntp servers have the correct time. These are Windows Domain Controllers.I have checked out the answer from here https://serverfault.com/questions/267629/configure-centos-with-ntp but that hasn't helped on this case.Any ideas?
Daylight saving option on Linux servers
timezone;ntp
Separate out the problem: is it a Timezone misconfiguration, or a time configuration? You can use a couple of tools, date and zdump to determine this.If date reports the correct UTC time, then you know the problem exists in the timezone setting, rather than in the internal time setting.$ date --utcFri Jun 28 14:02:43 UTC 2013$ dateFri Jun 28 10:02:45 EDT 2013zdump will print the current time (pulled from the internal UTC time) in the zone for each timezone specified$ zdump /usr/share/zoneinfo/Europe/London /usr/share/zoneinfo/GMT/usr/share/zoneinfo/Europe/London  Tue Jun 28 15:02:49 2013 BST/usr/share/zoneinfo/GMT            Tue Jun 28 14:02:49 2013 GMTIf the Europe/London zoneinfo file produces the same time as the GMT zoneinfo file, then either the contents of Europe/London or GMT are incorrect. I'd be surprised if this is the case, but if so, look to either reinstall the file from rpm, or otherwise correct it.  I believe there are programs available to read and output the zoneinfo contents, but don't know them as I just wrote my own that does it.If you reach the case that the internal UTC time is correct, and the zoneinfo file is correct, but date still reports GMT, then the setting for localtime is incorrect or stale. man tzset will tell you more than you want to know on how the local time conversion happens, but do an env and look at the settings for environment variables TZ, TZDIR. Finally compare the localtime config file with the desired setting: with cmp /etc/localtime /usr/share/zoneinfo/Europe/London