The Global Time Zone feature converts date and time fields to and from UTC.
Date and time data that is manually entered by users is converted to UTC based on the time zone that is stored in the user's profile. If the Time Zone field in the user's profile is NULL, the time zone defined by the Default Time Zone system preference is used.
Date and time data that is entered into the database by the system (date and time stamp) is converted to UTC by the server.
Date and time data that is displayed to users is converted from UTC to the time zone that is stored in the user profile. If the Time Zone field in the user's profile is NULL, the time zone defined by the Default Time Zone system preference is used.
NOTE: Date and time fields are converted to UTC. Date-only fields or time-only fields are not converted to UTC.
