In the Freename Explorer you can get a list of all registered SLDs for every existing TLD, but you can't see when they have been registered.
If you want to see the date of the last 20 registered SLD under any TLD, go to your TLD list in your account and open any of your own TLDs and then open the section "Associated Domains", so that the following link is visible in the address bar of your browser:
https://freename.io/portfolio/tlds/manage/TLD/associated-domain
Next, update the value close to the end of the string to any TLD that you want to see next, even though it isn't yours.
All you have to do is to overwrite the TLD and then press "Enter".
PS: Don't worry: you can't change any settings for TLDs that don't belong to you, but you can take a closer look.