# FastAPI DateTime Service

This is a simple FastAPI application that provides an OpenAPI-compatible `/datetime` endpoint returning the current date, time, weekday, and calendar week.

## Requirements

- Python 3.7+
- FastAPI
- Uvicorn

```bash
pip install -r requirements.txt
```

## Running the Application

To start the FastAPI server, run:

```bash
python main.py
```

The server will be available at `http://localhost:8000`.

## Endpoints

### `GET /datetime`

Returns current date, time, weekday, and calendar week.

**Response Format:**

```json
{
  "date": "2025-09-22",
  "time": "14:30:45",
  "weekday": "Monday",
  "calendar_week": 38
}
```

**Response Fields:**
- `date` (string): Current date in YYYY-MM-DD format
- `time` (string): Current time in HH:MM:SS format
- `weekday` (string): Full weekday name (e.g., "Monday")
- `calendar_week` (integer): ISO calendar week number