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

# InPriorDateRange

Determines if a date is within a specified date range in a previous time period.

**Category:** `date`

**Syntax:**

```
InPriorDateRange([date_column], "range_period", "prior_period", |offset|, |today|)
```

**Returns:** `BooleanColumn`

**Context Filtering:** ✓ Yes

## Parameters

| Name           | Type               | Required | Description                                                         |
| -------------- | ------------------ | -------- | ------------------------------------------------------------------- |
| `date column`  | `column\|datetime` | ✓ Yes    | The date to be evaluated.                                           |
| `range period` | `text`             | ✓ Yes    | The period for the date range.                                      |
| `prior period` | `text`             | ✓ Yes    | The period used to offset the range period.                         |
| `offset`       | `number`           | ✗ No     | Number of prior periods to offset by. Defaults to 1.                |
| `today`        | `column\|datetime` | ✗ No     | Override value for Today when calculating relative to current date. |

**Allowed Values for `range period`:** `year`, `quarter`, `month`, `week`, `day`, `hour`, `minute`, `second`

**Allowed Values for `prior period`:** `year`, `quarter`, `month`, `week`, `day`, `hour`, `minute`, `second`

**Allowed Column Types:** DATETIME, DATE

## Validation

* Minimum parameters: 3
* Maximum parameters: 5

## Examples

```
InPriorDateRange([Date], "hour", "day")
```

Returns True for all dates in the current hour of the day in the previous day.

```
InPriorDateRange([Date], "month", "year")
```

Returns True for all dates in this month last year.

```
InPriorDateRange([Date], "month", "year", 2)
```

Returns True for all dates in this month two years ago.