need to switch my 12/12 from 7pm-7am to 7am-7pm

if i had to do what you are doing, totally changing the schedule, i would leave them in dark for 24 hours then resume the new schedule..
 
To me.. I think it would be better for the plants if you left lights off 18 and on 6 ... 2 nights in a row until you got back on the schedule you want... Less shock to the plant I would guess... Just a guess though but if you are in 12/12 you dont want your plants to go back into the vegetative stage by having them on for 24 hours... might cost you a week or so for recoop...
 
To me.. I think it would be better for the plants if you left lights off 18 and on 6 ... 2 nights in a row until you got back on the schedule you want... Less shock to the plant I would guess... Just a guess though but if you are in 12/12 you dont want your plants to go back into the vegetative stage by having them on for 24 hours... might cost you a week or so for recoop...
You guess, well done.
 
leave on or leave off your choice .. once usually doesnt cause ill effects ... more then once does

happy growing
 
^^^^^ that and you could try to turn them off say about 4am then back on again around 930 and off at 7pm. Then you would be on schedule. They get that little nap in there.
 
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