Amazingly, the Google Analytics plugin here still works (if you bump the API), and should even track how long each player was online, although it might need some work to present the data in a useful way from what I'm seeing. All it really needs is AsyncTask - ofc it's not the same as an in-game command, but might be useful.
Try it here on Poggit. I updated a few things - added AsyncTask which is finally fixed in PMMP thanks to dktapps and sofe... and I included the death world in the data, as I'd like to know which worlds are unused. Let me know if there's problems, and if you want a better display of the data... Make a PR!