Siebel Global Deployment Guide > Deploying Siebel CRM with Global Time Zone > About Global Time Zone and Universal Time Coordinated (UTC) >

About Enabling UTC for Existing Deployments

This topic is part of About Global Time Zone and Universal Time Coordinated (UTC).

If you are upgrading a non-UTC deployment of a prior version and are now deploying with UTC, or if you have decided to convert an existing non-UTC implementation to UTC, then you must perform applicable tasks described in the following topics:

• Setting UTC System Preferences
• Setting the Database Server to UTC (this task is optional)
• Enabling Custom Date-time Fields and Columns for UTC (this task also applies whenever you create custom date-time fields)
• Converting Historical Data to UTC

See also Administering Time Zones.