How to set timezone environment variable to EST

Hello Experts
I'm having problem when I try to run my Enterprise Manager. Listner start normaly but then I tries to start the database I got the following message.
oracle@linux-f4y3:~> /apps/oracle/product/10.2.0/db_1/bin/emctl start dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://linux-f4y3.site:1158/em/console/aboutApplication
Timezone mismatch: The agentTZRegion value (EST) in
/apps/oracle/product/10.2.0/db_1/linux-f4y3.site_orcl/sysman/config/emd.properties
does not match the current environment TZ setting(EST).
The dbconsole cannot run with this mismatch.
If EST is the correct timezone, set your timezone environment variable to EST and repeat the 'emctl start dbconsole' operation.
If EST is not the correct timezone, make sure that the timezone in your environment is correct, and then run the following command in your local Oracle Home: 'emctl resetTZ agent'
The output of this command will include detailed instructions to follow, to correct the mismatch.
To me looks like I need to fix the timezone on my machine but I don't know how. Can please somebody shows me the steps how to achieve this task?
Thanks a lot in advance.

I believe this issue is occurring because timezone info between the OS and oracle is out of synch - possibly because timezone patches have been applied to the OS or oracle, but not both. It is always good practice to apply such patches to both OS and Oracle.
Pl see these MOS Docs
401834.1 - Problem: DST: Workaround to EM Agent Restart Problem Due to a Daylight Savings Change
362888.1 - Problem: Startup Agent: EM Agent will not start due to Timezone mismatch (Daylight Savings changes for Australia)
549079.1 - Troubleshooting Database Control Startup Issues
HTH
Srini

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