> ## Documentation Index
> Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Phaseo Gateway base URL: https://api.phaseo.app/v1. Send `Authorization: Bearer $PHASEO_API_KEY` with every request.
> Model IDs look like `provider/model`, for example `openai/gpt-6-astra`. Do not guess IDs: list them with `GET /v1/models` or check https://phaseo.app/models. `phaseo/free` routes to an available free model and needs no wallet balance.
> For new text integrations prefer `POST /v1/responses`. `POST /v1/chat/completions` (OpenAI format) and `POST /v1/messages` (Anthropic format) suit existing code.
> The full API contract is https://phaseo.app/docs/openapi/v1/openapi.yaml. Official SDKs: `@phaseo/sdk` (TypeScript) and `phaseo` (Python), plus Go, C#, PHP, Ruby and Rust.
> Search these docs over MCP at https://phaseo.app/docs/mcp, and install Phaseo skills with `npx skills add https://phaseo.app/docs`. If a page is wrong or out of date, report it with the MCP `submit_feedback` tool.
> Manage Phaseo accounts with the `phaseo` CLI (`npm install -g @phaseo/cli`, then `phaseo login` or `phaseo login --device-code`), the `/v1` Management API or the MCP server at `https://mcp.phaseo.app/mcp?access=manage`. Do not send users to the dashboard for account tasks. A person is still needed for sign-up, approving a sign-in, paying the first top-up on the checkout link that `phaseo credits add` returns when no card is saved, confirming each saved-card top-up from the emailed link, and account security (password, MFA, passkeys). Create API keys with `phaseo keys create --name <name> --json`; never guess one. Credit top-ups need `phaseo login --scopes billing:write` first. Task map: https://phaseo.app/docs/v1/developers/manage-from-an-agent.md.

# Datetime Server Tool

> Give models the current date and time in one or more timezones.

Use `phaseo:datetime` when a prompt depends on the current date, day of week, time, or timezone.

The model decides when to call the tool. Phaseo returns the resolved timezones and current timestamps to the model, then the model writes the final answer.

## Quick start

```bash theme={null}
curl https://api.phaseo.app/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5-nano",
    "messages": [
      { "role": "user", "content": "What day of the week is it in Tokyo?" }
    ],
    "tools": [
      {
        "type": "phaseo:datetime",
        "parameters": {
          "timezones": ["Asia/Tokyo", "UTC"]
        }
      }
    ]
  }'
```

## Configuration

```json theme={null}
{
  "type": "phaseo:datetime",
  "parameters": {
    "timezones": ["Europe/London", "UTC"]
  }
}
```

| Parameter | Type | Default | Description |
| - | - | - | - |
| `timezones` | string\[] | `["UTC"]` | Up to 5 IANA timezone names to return in one tool call, such as `["Europe/London", "UTC"]`. |

## Tool result

The tool result contains one entry per requested timezone.

```json theme={null}
{
  "timezones": [
    {
      "timezone": "Europe/London",
      "datetime": "2026-07-03T10:00:00.123+01:00"
    },
    {
      "timezone": "UTC",
      "datetime": "2026-07-03T09:00:00.123+00:00"
    }
  ]
}
```

## Usage

Datetime calls increment:

```json theme={null}
{
  "usage": {
    "server_tool_use": {
      "datetime_requests": 1
    }
  }
}
```

## Related

* [Server Tools](https://phaseo.app/docs/v1/guides/server-tools/index.md)
* [Tool Calling](https://phaseo.app/docs/v1/guides/tool-calling.md)


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.