### Answer Based on the available documentation, there isn't a way to set a default timezone at the agent or account level that would automatically populate when adding functions [(1) ]() . However, you can configure agent-level default dynamic variables that include timezone-specific time variables. You can set default values for dynamic variables at the agent level, which serve as a fallback when specific variables aren't included in the call request . For timezone-specific current time, you can use the system variable format

{{current_time_[timezone]}}

in your agent configuration [(1) ]() [(2) ]() . For example,

{{current_time_America/Chicago}}

or

{{current_time_Australia/Sydney}}

. When configuring functions that require timezone parameters (like Cal.com booking) , you'll still need to specify the timezone in each function configuration [(3) ]() :

json
{
  "type": "book_appointment_cal",
  "name": "book_appointment",
  "description": "Book an annual check up.",
  "cal_api_key": "cal_live_xxxxxxxxxxxx",
  "event_type_id": 60444,
  "timezone": "America/Los_Angeles"
}

Unfortunately, this timezone parameter needs to be set individually for each function and doesn't inherit from an account-wide default .

​ To learn more, see the sources I considered: [[1] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) [[2] Simulation Testing Now Live for All Agents](https://www.retellai.com/changelog/simulation-testing-now-live-for-all-agents-c27zh) [[3] Timezone mismatch during outbound calls despite correct profile & Cal.com event settings](https://community.retellai.com/t/timezone-mismatch-during-outbound-calls-despite-correct-profile-cal-com-event-settings/783) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.