# Function: isDateRange()

> **isDateRange**(`value`): `value is DateRange`

Returns true if `value` is a [DateRange](../type-aliases/DateRange.md) type.

## Parameters

| Parameter | Type |
| :------ | :------ |
| `value` | `unknown` |

## Returns

`value is DateRange`

## Source

[src/types/Matchers.ts:103](https://github.com/gpbl/react-day-picker/blob/9ad13dc72fff814dcf720a62f6e3b5ea38e8af6d/src/types/Matchers.ts#L103)