> For the complete documentation index, see [llms.txt](https://docs.fabricplan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fabricplan.com/documentation/plan/planning-sheets/formula-syntax/date-functions/period_range.md).

# PERIOD\_RANGE

The *PERIOD\_RANGE* function returns an array of dates between two specified dates. This function is commonly used with functions such as *FILTER* to evaluate and analyze data within a specific date range.

#### Syntax

```javascript
PERIOD_RANGE(fromDate, toDate)
```

#### Arguments

* `fromDate`: The start date of the range.
* `toDate`: The end date of the range.

#### Return value

Returns an array of dates within the specified range.

#### Example

```javascript
PERIOD_RANGE(DATE(2023, 1, 1), DATE(2023, 12, 31))
```

Creates a date range for all dates in the year 2023.

#### Usage with forecasts

The *PERIOD\_RANGE* function can be used with forecast data to analyze values within open forecast periods. In this scenario:

* `PERIOD_RANGE` selects the open forecast periods.
* `FILTER` returns forecast values greater than 1000 within those periods.
* An aggregate function such as `SUM` calculates the total of the filtered forecast values.

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