If you are on NA, in a NA clan you should use a NA nightime. You are not fighting but yourself, but with your clan and more importantly with your community.
The way I see it is if you are not able to be at your pc then those times are your nightime. I can wake up at 4am, i cant skip work or school at noon to fight a strat battle. Although It might take a whole strat fighting Mercs at 3am on a regular basis to agree with this. :p
The real problem here though is just strat times in general. Its seems over half of our big NA battles have been on lame times (my factions inc) even though it is not the intended result. Any "big" battle should be reserved for primetime slots no matter what their iniated attack is. Yeah there will always be an aderyn or that grave yard shift guy that misses out, but strat is for the community to enjoy, and these current battle time features hurt the community.