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how to know if a weed seed is autoflower

Is there any way to tell if a plant is autoflower or photoperiod?

Hi guys, friend of mine got some unknown seeds and we were wondering if they're autoflowering or photoperiod plants. His plants are about 6 weeks old now, maybe a little more, about 30 centimeters high and still not showing any signs of sex, he grows outdoor. We're both pretty new to this (1st grow for both of us), so we can't really tell the difference. So my question is, as the title says. Is there any way to tell if a plant is autoflower or photoperiod? Sorry there is no picture I don't have any atm.