lilbp420answered grow question 6 years ago If it has been over a month at 12/12 (but your diary still says 18/6 lighting) and still no buds I would be looking for a light leak in the tent. In my case I added a new temp sensor that had a red led light the flashed every polling interval (~5 minutes). Once I taped over that light I started flowering.
I would zip myself in the tent for a few minutes at lights out and see if there are any leaks.