christophwelling
commented
4 years ago Astropy 4.0 is what made this change necessary. Astropy 3.0 works fine. I agree that it is ugly, but I don't know a more elegant way to fix this. The best solution would be to strongly discourage using datetime, but even then we still need this to read old files
The way datetime was converted to astropy time breaks with astropy version 4.0. This one works for both 4.0 and 3.0.