I think you need to shift your understanding of cardio. The goal really is not to "burn" fat while your doing it, but more to support an inhanced metabolism. For instance, when you look at Hiit cardio, it is recomended for fatloss, not because you burn more cals doing it, infact, with the duration you actually burn less then if you were to go run for 30 minutes, but it helps to keep your metabolism high for hours after you have finished.

All that being said, it really wont matter when you do your cardio (night/day). and if it does make a difference, it will be a very small one.

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