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 In date is a direct opposite of out of date (that is, it says that something is valid); but where out of date implies expiry has already happened, using not yet implies something is still to happen.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 But in that case, I wouldn't say the car engine is "out of date" either.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.

"The correct answer is 'Contemporary'.  Key Points The exact antonym of the given word 'Obsolete' is 'Contemporary'.  Obsolete: no longer produced or used; out of date. (अब उत्पादन या उपयोग नहीं किया जाता है) Example: The disposal of old and obsolete machinery. ​Contemporary: belonging to or occurring in the present. (वर्तमान में होने या होने वाला) Example: The event was recorded by a contemporary historian. ​By reading the above definitions we find that the correct answer is 'Contemporary'.    Correct Answer: Contemporary.  Additional Information The meaning of the other options given in the question as follows:  Old: having lived for a long time; no longer young. (लंबे समय तक जीवित रहा) Outdated: out of date; obsolete. (अप्रचलित) Extinct: (of a species, family, or another group of animals or plants) having no living members; no longer in existence. (अब अस्तित्व में नहीं है)"