i read your comments the question what i asked seems to be simple but its involving more intelligence<
You are calling the kettle black. Blaming the responder for not understanding your "fancy" abbreviation. Very few (if any) of the responsers above lack the intelligence to answer "why negative value is entered into the timer". Most have "the intelligence" to realize that you are too lazy to spell words out.

Did you even consider how fast you would have had the answer you need (since, for some reason, you did not understand Russells Clear and correct answer that you got in 17 minutes) if you had written "negative" ?

Ok go ahead, we are idiots that we do not have the ability to figure out what you think, but have to rely on what you write.

Erik

PS for those that do not know: "calling the kettle black" is an american expression for blaming someone for doing something you do yourself.