When does the Natural 12/12 begin?

What exact date does sunlight and darkness become equal? I heard it's in late September. The only reason I ask is because I have been leaving my girl outside for 12 hours and bringing her into my dark room for 12 hours. I want to eventually leave it outside when the natural 12/12 cycle comes around which is pretty soon. LEt me know when this is and is this a good idea to leave it outside when this natural cycle begins or continue doing the 12/12 cycle manually? Thanks guys!

All depends on if your in the northern hemisphere or southern.

If northern its normally around august time.

In the tropics however, its any day of the year, as they have 12 hours of sunlight and darkness everyday.

earlier than September in the southern states. I put a month old on the porch in august and they sexed...quicker then i thought too.

Well, I live in SouthEast Michigan and I have definately noticed the days getting shorter. Do you guys think this is a good idea to just leave her outside until I harvest then? Or should I continue the manual way? She started flowering about 18 days ago so I want to keep those buds coming.

canada around late august beginning of september.

This site shows sunset, sunrise by the month for each state
SunriseSunset.com - U.S.A. States List

yeah, on the local weather report alot of time they'll give the sun-up sun-down times each day, when they are 12-12 your good.

we now have 12hrs and 40 mins of daylight ...the equanox..or 12/12 is going to be sept 25th ....thats when...smoke on.peace...