How Long Does Weed Stay in Your System?

Today being 4/20 I couldn't resist but to celebrate. I am also unemployed and probably will have to take a drug test to get hired at my next gig. I googled How Long Does Weed Stay in Your System but most of the posts, like this one http://stuffstonerslike.com/2015/05/how-long-does-weed-stay-in-your-system/ were published a while ago and i want to find the most accurate information.

Do I have to wait a month for this stuff to pass or what? All help would be appreciated.
 
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