---
url: /process-functions/datasource-filelastmodified.md
description: >-
  Retrieves the last modified timestamp of a specified file from the MODLR
  filesystem.
---

# datasource.fileLastModified

Retrieves the last modified timestamp of a specified file from the MODLR filesystem.

```js
datasource.fileLastModified(file_name)
```

#### Parameters

* `file_name` (string): The name of the file for which you want to retrieve the last modified timestamp.

#### Returns

* `number`: An integer representing the last modified timestamp of the file in milliseconds since the Unix epoch (January 1, 1970, 00:00:00 GMT). Returns `0` if the file is invalid or an error occurs.

#### Examples

```js
var lastModifiedTimestamp = datasource.fileLastModified("my_file.txt");
if (lastModifiedTimestamp > 0) {
    var lastModifiedDate = new Date(lastModifiedTimestamp);
    console.log("File was last modified on:", lastModifiedDate);
} else {
    console.log("Error retrieving last modified date or invalid file.");
}
```