Hi Jane,

Zendesk stores all of its data in UTC time. Everything, including the API, and any emails or ticket events, has a hardcoded UTC timestamp attached to it.

The agent UI in Support is designed to convert the hardcoded UTC timestamp to the user's current time zone.

Also, please note that timestamps can be displayed in different time zones across your Zendesk account, depending on your configuration. You can refer to Which time zone does Zendesk use? for more detailed information.

Hope this helps!