[Python] How to convert J2000 time to UTC in python?

I have time in J2000 format, ie. seconds after noon on 1-1-2000, which I want to convert to UTC time in an array with the format [year-month-day hour:min:sec.millisec]. Is there some function in AstroPy or something similar to do the conversion?

Input: Time in J2000: 559889620.293 seconds

Desired Output: Time in UTC: 2017-09-28 16:53:40.293

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