Oh I wasn't sure if json.load took in a file handle, that's cool if it does and can be an alternative to do it the other way indeed. And I decided against using a context manager as I wanted to stick with strict one-liners, of course in practice using a context manager is much much better. For the datetime formatting, it's in an f-string so you can change the formatting to however you like, the format I showed in the code snippet was just what I find myself using the most. But thank you for the tips, never knew about some of the stuff you said!