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Are you using the beta version of the 1.13 expansion?
Can you TL;DR tell me what you want? An expansion for MultiVerse? If so, what all do you want in it.
Does MultiVerse provide the alias option?
If you get the millis from when you started the world, you could then use the JS to calculate the different between those times.
No. There's not really a way to do that unless you make one custom with JS from a specific milisecond.