Knowledge Base

ESX

1. Log into the ESX service console as root.
2. Find the desired time zone under the directory /usr/share/zoneinfo . Some regions have multiple files in a subdirectory. For example, US contains several files, each representing a time zone.
   
   Note: The example below uses /usr/share/zoneinfo/US/Pacific as the new time zone file.
3. Use nano ( or another text editor) to open /etc/sysconfig/clock . At the command prompt, type:
   
   nano /etc/sysconfig/clock
   
   Edit this file to show the relative path to the file representing the new time zone, and ensure that UTC and ARC are set as shown:
   
   ZONE="US/Pacific"
   UTC=false
   ARC=false
4. Copy or link the desired time zone file to /etc/localtime . Continuing the example using US/Pacific :
5. • To copy, run:
     
     cp /usr/share/zoneinfo/US/Pacific /etc/localtime
   • To link, run:
     
     ln -s /usr/share/zoneinfo/US/Pacific /etc/localtime
     
     Note: If you receive a overwrite `/etc/localtime'? prompt, answer y to replace the file representing the old time zone. Again, it is not necessary to reboot the ESX host after updating /etc/localtime .
6. Confirm that /etc/localtime has been updated with the correct zoneinfo data:
   
7. 1. Reference the zoneinfo file used in step 2 and compare it to / etc/localtime using the diff command:
      
      [root@esxhost]# diff /etc/localtime /usr/share/zoneinfo/US/Pacific
      
      If the files are identical, your prompt returns without any output.
      
      
   2. If /etc/localtime is not the same as the /usr/share/zoneinfo/<your location> , the output from the diff command appears similar to:
      
      Binary files /etc/localtime and /usr/share/zoneinfo/US/Pacific differ
      
      If the files are not the same, repeat step 4.

After updating /etc/localtime with the correct zoneinfo data, confirm the system and hardware clocks are correct. Use the Linux date command to check and set the correct time if necessary. Set the hardware clock to match the correct system time:

1. Set the system clock to the local date and time:
   
   date MMDDhhmmYYYY
2. Update the hardware clock with current time of the system clock:
   
   /sbin/hwclock --systohc

• Upon booting, ESX runs /etc/rc.d/init.d , which reads /etc/sysconfig/clock to set the system clock based on the hardware clock's current time and the configured time zone information. To synchronize ESX to an external time reference, see Installing and Configuring NTP on an ESX host (1339) .
• You may be required to restart the vSphere Client for the timezone information to be updated within the GUI.

ESXi

Note: The date and time of the host have been translated to the local time of this VI Client.

Note: The date and time of the host have been translated to the local time of this vSphere Client.