does theta decay on weekends 
yes theta decays on weekends options models usually take into consideration weekends so decay will occur over seven days for five trading days can theta be positive and what would that mean theta can appear positive particularly when you re short or writing an option if you ve sold an option the passage of time works in your favor making the option less valuable which is good when you eventually buy it back at a lower price or let it expire worthless in the case of selling options while the theta of the option itself is still technically negative the effect on your position is positive 