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# Pendulum

Native Pendulum DateTime object implementation. This is a copy of the Pendulum DateTime object, but with a Pydantic CoreSchema implementation. This allows Pydantic to validate the DateTime object.

## DateTime

**Bases:** `_DateTime`

A `pendulum.DateTime` object. At runtime, this type decomposes into pendulum.DateTime automatically. This type exists because Pydantic throws a fit on unknown types.

```python
from pydantic import BaseModel
from pydantic_extra_types.pendulum_dt import DateTime


class test_model(BaseModel):
    dt: DateTime


print(test_model(dt='2021-01-01T00:00:00+00:00'))

# > test_model(dt=DateTime(2021, 1, 1, 0, 0, 0, tzinfo=FixedTimezone(0, name="+00:00")))
```

## Time

**Bases:** `_Time`

A `pendulum.Time` object. At runtime, this type decomposes into pendulum.Time automatically. This type exists because Pydantic throws a fit on unknown types.

```python
from pydantic import BaseModel
from pydantic_extra_types.pendulum_dt import Time


class test_model(BaseModel):
    dt: Time


print(test_model(dt='00:00:00'))

# > test_model(dt=Time(0, 0, 0))
```

## Date

**Bases:** `_Date`

A `pendulum.Date` object. At runtime, this type decomposes into pendulum.Date automatically. This type exists because Pydantic throws a fit on unknown types.

```python
from pydantic import BaseModel
from pydantic_extra_types.pendulum_dt import Date


class test_model(BaseModel):
    dt: Date


print(test_model(dt='2021-01-01'))

# > test_model(dt=Date(2021, 1, 1))
```

## Duration

**Bases:** `_Duration`

A `pendulum.Duration` object. At runtime, this type decomposes into pendulum.Duration automatically. This type exists because Pydantic throws a fit on unknown types.

```python
from pydantic import BaseModel
from pydantic_extra_types.pendulum_dt import Duration


class test_model(BaseModel):
    delta_t: Duration


print(test_model(delta_t='P1DT25H'))

# > test_model(delta_t=Duration(days=2, hours=1))
```

### Methods

#### to\_iso8601\_string

```python
def to_iso8601_string() -> str
```

Convert a Duration object to an ISO 8601 string.

In addition to the standard ISO 8601 format, this method also supports the representation of fractions of a second and negative durations.

##### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str) -- The ISO 8601 string representation of the duration.

## Related pages

- [API Documentation](./api-documentation-index.md)
- [Concepts](./concepts-index.md)
- [Dev Tools](./dev-tools-index.md)
- [Error Messages](./error-messages-index.md)
- [Examples](./examples-index.md)
- [Integrations](./integrations-index.md)
- [Internals](./internals-index.md)
- [Production Tools](./production-tools-index.md)
- [Pydantic](./pydantic-index.md)
- [Pydantic Core](./pydantic-core-index.md)

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