One of the greatest labor saving devices of today.

an undetermined time period spanning from never to eternity, often used when talking to a girl

A mythical period in time which everyone knows about but has no memory of.
A lot of people say that it is the day after today and that tomorrow will be here at midnight, but if you actually wait until midnight it is today again.
Often used by people to put off work as the new required deadline will never arrive.

(noun) The day when all essays currently being written are due.

One of the greatest labor saving devices of today.

(University setting) the lnext time a class will meet, whether or not that is the day following today.

Maybe the next day, or maybe a week from today. It's a generic term for the future, ≥ 1 day and ≤ 1 week.