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This topic is part of About Global Time Zone and Universal Time Coordinated (UTC).
CAUTION: Once you have already deployed your Siebel applications using UTC and created user date-time data in UTC format, it is not supported to stop using UTC by setting the Universal Time Coordinated system preference to False. Otherwise, incorrect time stamp values might be created and displayed.
CAUTION: For an upgrade to the current version, if Universal Time Coordinated is True following the upgrade and you do intend to deploy with UTC, then you must run the UTC conversion utility before any new date-time data is created in UTC format. For details, see Converting Historical Data to UTC.
For deployments using Siebel Remote and Siebel Mobile Web Clients, first synchronize all of the local databases, then reinitialize and re-extract the local databases after you upgrade and convert to UTC. Synchronize all of the local databases before upgrading.
When deploying with UTC for new or upgrade deployments that contain custom date-time fields, you must perform the tasks in Enabling Custom Date-time Fields and Columns for UTC.
Deploying Siebel applications using UTC does not require you to set the operating system clock for the database server computer to UTC (a GMT time zone without DST). This optional task is described in Setting the Database Server to UTC.
Siebel eScript provides a set of methods for working with UTC data, along with methods for non-UTC date-time data. Use the appropriate methods for your deployment. All processing of UTC data performed by eScripts is completely independent of the UTC conversion capabilities of the Application Object Manager.
CAUTION: If you import appointment or activity data into the Siebel application (with UTC enabled) from another system that does not use UTC, then additional requirements apply. For more information, see Converting Historical Data to UTC.
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