How to create collection behaviors (timestampable...)?

I would like to create collection behaviors by myself such as timestampalte, softremovable…
Please help me

You can search on Atmosphere for packages. For example a search for “softremovable” returned following

Also if you don’t find anything, it’s always a great opportunity to create a package yourself to give back to the community :smile:

I found some package, but it out of date.
I would like to try to create it by myself.
Thanks for your helping