Opposite of "out of date"? [closed]

One way is to use Not yet in date.

That can be used with things like coupons which have a validity period which hasn't yet been reached. In date is a direct opposite of out of date (that is, it says that something is valid); but where out of date implies expiry has already happened, using not yet implies something is still to happen.

While this does work for coupons with a start date, it won't work with the example of the car part. But in that case, I wouldn't say the car engine is "out of date" either. The engine's design is simply too old for the part; or the part's design is too new for the engine.

Premature implies a thing that is before its time.

The green banana is premature until it ripens.

The coupon is premature until the start date.

The spare part is premature for an engine that has not been introduced on the market.

Alternately as suggested by ScotM

Post-dated

The new part for an old engine is post-dated.