Backdating a blog post on Squarespace is possible, but it will require some extra work. To backdate a post, first go to the Posts tab on your Squarespace account and find the post you want to backdate. From here, click on the date next to the post’s title. This will take you to a new window where you can enter the date that you want your post to appear as.
Once you’ve entered the correct date, click Save Changes. Your blog post will now appear as if it was published on the date you specified.