# TO_DATEPERIOD

Converts an input value into a `date_period` value.

## Syntax

`TO_DATEPERIOD(field)`

### Parameters

#### `field`

The input value. This must be a valid constant date period expression.

## Examples

```esql
ROW x = "2024-01-01"::datetime
| EVAL y = x + "3 DAYS"::date_period, z = x - TO_DATEPERIOD(`3 days`)
```

This example demonstrates how to add and subtract a `date_period` value to/from a datetime field.