Some people like to keep them separated because they are both very taxing on the body, and both use glycogen as their main source of fuel.
It's not NECESSARY to keep them separate, but that is why some choose to do so.
I do mine the same day. HIIT in the morning, weights at night. It shouldn't be a problem if they're separated by about 6 hours.
Also, it's easier to keep your intervals timed if you're using a machine, such as a treadmill, or an elliptical. But, if you're doing it outside you can do it a bunch of different ways....
Go to a Football field and sprint the length of the field, and walk/jog the corners. You can do that on a track as well. You can sprint the length of the track and walk/jog the curves.
If you're running on the street, you can sprint the length of a block (depending how long your blocks are) and walk the ends.
If I'm outside on the street, I sprint the length of my block and I walk the end around and then sprint up the other side of my block, etc.
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