# CLOSEDPERIOD

When you need to perform an action specific to the closed or open periods in a forecast, you can use the .CLOSEDPERIOD in conjunction with \[Forecast] to refer to the closed periods. To refer to the open periods, use the NOT operator along with the CLOSEDPERIOD function. 

## Example

Let us say we want to add adjustment values to the open periods while marking 'closed' for the closed periods. To refer to the closed periods, we have used \[Forecast].CLOSEDPERIOD in the example below. To check and execute the action we have used the conditional statement, [IF](https://docs.inforiver.com/premium-table/formula-syntax/conditional-statements).

<figure><img src="https://content.gitbook.com/content/sB9HAei8v4FfKkH9M4gw/blobs/6YzZg2akWh8vw6z81mcd/Forecast%20reference.png" alt=""><figcaption><p>.CLOSEDPERIOD</p></figcaption></figure>