​ To learn more, see the sources I considered: [[1] Timezone configuration](https://discord.com/channels/1186424376300679209/1305664114957352993) [[2] Discord message from @eviewang_ on 2025-03-03](https://discord.com/channels/1186424376300679209/1186462578310910112/1345938795194748948) [[3] Discord message from @gregb5117 on 2025-03-03](https://discord.com/channels/1186424376300679209/1186462578310910112/1345937892895101148) ​

### Answer To handle system time and timezone configuration in Retell AI, you can use the

{{current_time}}

dynamic variable in your prompts. [(1) ]() For timezone-aware implementations, you have a couple of approaches: Option 1: Prompt-based timezone adjustment Include the current time in your system prompt with timezone offset instructions: "Now is {{current_time}}. Add X hours to make it our timezone". [(2) ]() [(3) ]() Option 2: Dynamic variables via backend Pass the current time into the prompt with a dynamic variable when initiating or receiving calls via your backend or no-code tools like Make, n8n, or Zapier. [(3) ]() For business hours implementation, you can state the hours in your global prompt and call transfer instructions, then reference the current time using the methods above. [(2) ]() [(3) ]() Note that timezone-aware

{{current_time}}

functionality is on the roadmap for native support.

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

Thanks for the follow-up, @Alex. I'll get back to you soon.

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

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

​ To learn more, see the sources I considered: [[1] Create Voice Agent](https://docs.retellai.com/api-references/create-agent) [[2] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) ​

### Answer The

voice_emotion

setting is only supported by specific TTS providers, not all voices. [(1) ]() [(2) ]() According to the documentation, emotional tone controls are "currently supported for Cartesia and Minimax TTS providers." This means that even if you're using the same voice name (like "Cimo") across different providers, the available settings will vary depending on which TTS provider that voice uses. Available voice_emotion options include: -

calm

-

sympathetic

-

happy

-

sad

-

angry

-

fearful

-

surprised

Settings available for all voices: -

voice_speed

- Controls speech rate (range 0.5-2) -

volume

- Controls loudness (range 0-2) -

voice_temperature

- Controls voice stability (range 0-2, where supported) So if you're seeing different settings across agents using "Cimo" voices, it's because they're using different TTS providers. Cartesia and Minimax versions will show emotion controls, while other providers (like ElevenLabs, OpenAI, etc.) will only show the basic speed and volume controls.

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