OEM Agent : The agentTZRegion value not in Agreement

Due to DST  changes some days back we see couple of OEM Agents failed to start with below mentioned errors:

oracle@machine[TEST01]> ./emctl start agent
Starting agent ......... failed.
The agentTZRegion value in /orcl/app/oracle/agent11g/sysman/config/emd.properties is not in agreement with what agent thinks it should be.Please verify your environment to make sure that TZ setting has not changed since the last start of the agent.
If you modified the timezone setting in the environment, please stop the agent and exectute 'emctl resetTZ agent' and also execute the script mgmt_target.set_agent_tzrgn(<agent_name>, <new_tz_rgn>) to get the value propagated to repository.
Consult the log files in: /orcl/app/oracle/agent11g/sysman/log

OS level time as changed but it's not changed in Oracle Agent binaries. We have manaully fix it using below menthod:

1. Set the Correct Env variable to TZ parameter

oracle@machine[TEST01]> echo $TZ
Europe/Moscow
export TZ=Etc/GMT-4

2. Reset the agent time zone using emctl resetTZ agent

oracle@machine[TEST01]> ./emctl resetTZ agent

Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
Updating /orcl/app/oracle/agent11g/sysman/config/emd.properties...
Successfully updated /orcl/app/oracle/agent11g/sysman/config/emd.properties.

Login as the em repository user and run the  script: ( OEM Grid )
exec mgmt_target.set_agent_tzrgn('machinename2:1830','Etc/GMT-4')
and commit the changes

This can be done for example by logging into sqlplus and doing
SQL> exec mgmt_target.set_agent_tzrgn('machinename:1830','Etc/GMT-4')
SQL> commit

3. Agent started:

oracle@machine[TEST01]> ./emctl start agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
Starting agent ..................... started.

Reference Metalink ID note:
DST Compliance for Grid Control OMS, Repository and Agents: Checks and Updates [ID 457792.1]