I know the payout period is the 1-15th and 16-31st. Is it like 15th until end of day? Like if i broadcast on the 15th what time do i have until to convert my tokens to get it for the 22nd payment? And what time-zone?

To the 15th is until the end of the business day – California time as Chaturbate HQ is based in CA. You will have a timer for when your tokens need to be cashed out on your token stats page.