ZST™
An unofficial, trademarked, timezone. Refers to an individual that confidently asserts a given timeframe of arrival/departure that is so consistent in failing to meet the self-established timeframe, that a new timezone is established within restraining order distance of the individual to allow leinecy. This timezone is trademarked as an analogy to the aforementioned consistency.
Zach promised he would be back from Hillsborough in 2 hours, "tops". I've since established a ZST™, allowing him to only experience 2 hours to alleviate the 5 hours that would have passed otherwise.