Hey little,
It would be fine to start your schedule anytime you want! Being in the dark is cool. It would just put them in the dark for a few more hours before you flower.:thumbsup: You'll be fine with whatever you choose. 12/12 is what you want.I have mine turn on at 7pm and off at 7am. Just can't go back to vegging once you start flowering. You could.. But why? Go with your plan and hope all goes well with your surgery.