I am trying to fine out what time it starts to gets dark in Sep.of 2010

Sunset will be after 7pm, so it gets dark a little after that.
Since it's only a few miles from you it will be only a few minutes difference. http://www.sunrisesunset.com/ not only gives you sunrise and sunset but also does things like phases of the moon and twilight times. Turns out there is a different twilight time depending if you are on land, in the air or on a boat. Since you are talking about Stockton I presume your concern is to avoid being robbed. Take a look at twilight times. The human mind and eyes have trouble processing imagery then so you are more vunerable.
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