Answer (1 of 5): I am answering only based on US law. You want to use the date when you originally created the site to show when you began asserting copyright protection. Since pages are updated regularly, you also would want to use the current year to assert rights in the new material. So I agre...
Errr... pretty sure the last date of an update was 2022... so it's reasonably assured it's a correct date for the script being version used if it's the latest.
Your SITE can use a more recent date, as it's kept up to date more frequently than the script is.
I don’t understand why anyone wants the copyright date to be the current year. If you want that date to help you protect the copyright, it needs to be the date at which original copyright was created.
So a copyright date of 2023 will not help protect any content created in 2022 or 2021 etc.
Not that the copyright notice actually does protect anything in many/most cases - although I suppose it can help if someone who steals your content claim they didn't know you were the copyright owner of licensee.