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

# TimeRange

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `end` | [date](https://docs.python.org/3/library/datetime.html#date-objects) | :heavy\_check\_mark: | ISO 8601 UTC timestamp. Must include seconds (YYYY-MM-DDTHH:MM:SSZ; fractional seconds allowed); minute-precision timestamps are rejected. | 2027-12-31T23:59:59Z |
| `start` | [date](https://docs.python.org/3/library/datetime.html#date-objects) | :heavy\_check\_mark: | ISO 8601 UTC timestamp. Must include seconds (YYYY-MM-DDTHH:MM:SSZ; fractional seconds allowed); minute-precision timestamps are rejected. | 2027-12-31T23:59:59Z |