Is there a function to cast INT to DATE or DATE to INT for timestamp filtering?

Is see no such function in Google BigQuery datetype pages.

Below is the query i had made for a public dataset for testing:

```
SELECT title, comment, contributor_username FROM [bigquery-public-data:samples.wikipedia] WHERE wp_namespace = 3 AND timestamp = ??

```

[Image](https://i.stack.imgur.com/M94uR.png)

As shown in the image in attached link, the timestamp column is INT datetype.