"Last time online" option

Hello, Is it possible to add a short line next to the online/offline dot (the one in green or gray according to log status) specifyting the last time when the user (customer or designer) has logged in (example: "last time online: 5/28/19 8:30pm GMT+1")?

Is it also possible to make the date of a certain message be more specific like   " posted : 5/28/19 8:30pm GMT+1" ? Can the order of messages be descending (the latest, the lowest in order) ?

I've attached a mock-up of how I imagined it (the dates of post and logins are not chronologically correct, it's just to show how I imagined them).