### Answer Yes, you can pass timezone information dynamically using Retell AI's system default dynamic variables. [(1) ]() Retell provides timezone-aware dynamic variables that you can use in your agent prompts: -

{{current_time}}

- Current time in

America/Los_Angeles

-

{{current_time_[timezone]}}

- Current time in a specified timezone, for example:

{{current_time_Australia/Sydney}}

-

{{current_hour}}

- Current hour as a fraction in

America/Los_Angeles

-

{{current_hour_[timezone]}}

- Current hour as a fraction in specified timezone -

{{current_calendar}}

- 14-day calendar in

America/Los_Angeles

-

{{current_calendar_[timezone]}}

- 14-day calendar in specified timezone To dynamically set the timezone, you can use nested variables. For example:

{{current_time_{{my_timezone}}}}

If you set

my_timezone

to

America/Los_Angeles

, this evaluates to

{{current_time_America/Los_Angeles}}

first, then resolves to the actual time. You can pass the

my_timezone

variable when creating a call using the

retell_llm_dynamic_variables

field in the Create Phone Call API. [(1) ]() [(2) ]() In your agent prompt, include the current time reference so the agent understands temporal context. For example: "Now is {{current_time_{{timezone}}}}. Add X hours to make it our timezone". [(3) ]()

​ To learn more, see the sources I considered: [[1] Dynamic variables: personalize Retell agent calls](https://docs.retellai.com/build/dynamic-variables) [[2] Register Phone Call](https://docs.retellai.com/api-references/register-phone-call) [[3] Discord message from @eviewang_ on 2025-03-03](https://discord.com/channels/1186424376300679209/1186462578310910112/1346027640208756767) ​

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

@AI Evy so i can sat {{my_timezone}} is est in the agent?

### Answer You can set default dynamic variables at the agent level, including

{{my_timezone}}

. [(1) ]() To set a default timezone for your agent: 1. Configure agent-level default dynamic variables in your agent settings 2. Set

my_timezone

to your desired timezone (like

America/New_York

for EST) Then use nested variables in your prompts:

{{current_time_{{my_timezone}}}}

This evaluates to

{{current_time_America/New_York}}

and then resolves to the actual time. Important: Use IANA timezone identifiers (like

America/New_York

) rather than abbreviations like "EST", as the system variables expect full timezone names like

America/Los_Angeles

or

Australia/Sydney

. For production calls, you can override the agent-level default by passing

my_timezone

in the

retell_llm_dynamic_variables

field when creating a call. [(1) ]() [(2) ]() Agent-level defaults only apply when specific variables aren't included in the call request. [(1) ]()

​ To learn more, see the sources I considered: [[1] Dynamic variables: personalize Retell agent calls](https://docs.retellai.com/build/dynamic-variables) [[2] Create Phone Call](https://docs.retellai.com/api-references/create-phone-call) ​

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

### Answer No, that setup isn't correct. You're mixing two different approaches. [(1) ]() Option 1: Use the system variable directly If you want to reference the current time in New York timezone, use:

{{current_time_America/New_York}}

Option 2: Use nested variables for dynamic timezone If you want to set

my_timezone

as a variable that can be changed per call, set it up like this: 1. Set

my_timezone

to

America/New_York

(just the timezone name, not the full expression) 2. In your prompt, reference it as:

{{current_time_{{my_timezone}}}}

This evaluates in two steps: first

{{my_timezone}}

becomes

America/New_York

, then

{{current_time_America/New_York}}

resolves to the actual time. Your error: You're trying to assign

{{current_time_{{America/New_York}}}}

to

{{my_timezone}}

, which creates invalid nested syntax. The variable

my_timezone

should contain only the timezone identifier string (like

America/New_York

) , not the full time expression.

​ To learn more, see the sources I considered: [[1] Dynamic variables: personalize Retell agent calls](https://docs.retellai.com/build/dynamic-variables) ​

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

### Answer For testing in your global prompt with Central Time, add this: [(1) ]()

The current time is {{current_time_America/Chicago}}. Use this as your reference for all time-related conversations.

For dynamic timezone support that you can override per call, use this approach: Step 1: Set agent-level default In your agent's default dynamic variables, set: - Variable name:

my_timezone

- Value:

America/Chicago

Step 2: Reference it in your global prompt:

The current time is {{current_time_{{my_timezone}}}}. Use this as your reference for all time-related conversations.

This nested variable syntax first resolves

{{my_timezone}}

to

America/Chicago

, then evaluates

{{current_time_America/Chicago}}

to the actual time. Step 3: Override dynamically per call When creating calls via API, pass different timezones in `retell_llm_dynamic_variables`:

json
{
  "my_timezone": "America/New_York"
}

The agent-level default (

America/Chicago

) only applies when you don't provide

my_timezone

in the call request.

​ To learn more, see the sources I considered: [[1] Dynamic variables: personalize Retell agent calls](https://docs.retellai.com/build/dynamic-variables) ​

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

@AI Evy { "from_number": "+14328887928", "to_number": "+14074888682", "override_agent_id": "agent_fd7f7da2e78727ae2f59d2caaa", "agent_override.agent.timezone" : "America/Chicago" } okay?

### Answer No, that's not the correct structure. You have two separate issues: [(1) ]() Issue 1: Wrong field name

agent_override.agent.timezone

is not a dynamic variable field. The

timezone

field is part of the agent configuration itself, not how you pass dynamic timezone values per call. Issue 2: Wrong structure for agent_override If you want to use

agent_override

, the structure should be nested objects, not dot notation. Correct approach for dynamic timezone:

json
{
  "from_number": "+14328887928",
  "to_number": "+14074888682",
  "override_agent_id": "agent_fd7f7da2e78727ae2f59d2caaa",
  "retell_llm_dynamic_variables": {
    "my_timezone": "America/Chicago"
  }
}

[(2) ]() [(1) ]() This passes

my_timezone

as a dynamic variable that your prompt can reference using

{{current_time_{{my_timezone}}}}

. [(2) ]() Alternative: Set agent timezone directly in agent_override If you want to override the agent's timezone setting itself (not as a dynamic variable) , use:

json
{
  "from_number": "+14328887928",
  "to_number": "+14074888682",
  "override_agent_id": "agent_fd7f7da2e78727ae2f59d2caaa",
  "agent_override": {
    "agent": {
      "timezone": "America/Chicago"
    }
  }
}

[(1) ]() The first approach (using

retell_llm_dynamic_variables

) is recommended for your use case since you want to dynamically pass timezone per call. [(2) ]() [(1) ]() **

​ To learn more, see the sources I considered: [[1] Create Phone Call](https://docs.retellai.com/api-references/create-phone-call) [[2] Dynamic variables: personalize Retell agent calls](https://docs.retellai.com/build/dynamic-variables) ​

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