I've seen this defined in some infrastructure bill (usually it's not defined). 1 job created really means 1 job for a year. If the job exists next year too, it's apparently created that year too. This doesn't match with my definition of creation, but it seems to better match up with reasonably likely job outcomes of projects advertised as job creation.

Eg: this factory will create 13000 jobs over the next 5 years doesn't mean there will be 13000 more working people in 5 years, it just means 13000 man years of work in the 5 year period.