unexpired
adjective
- Not expired.
- Of food, still edible.
- Of an agreement, coupon, or law, still in force.
The opposite is simply unexpired. Not used very frequently, but it is a real word.
More common usages are either more specific (e.g. fresh as opposed to expired when talking about food spoiling), or use more words (e.g. still good, which is probably used more often than unexpired to mean the same, but is rather informal).
Answer from KRyan on Stack ExchangeThe opposite is simply unexpired. Not used very frequently, but it is a real word.
More common usages are either more specific (e.g. fresh as opposed to expired when talking about food spoiling), or use more words (e.g. still good, which is probably used more often than unexpired to mean the same, but is rather informal).
How about active?
Though I would consider using inactive as the opposite in this case.
P.S. Last time I used effective as the opposite of expired for a price object (in programming)
I would simply use the term non-expiring. For example, in Washington state, one can obtain a non-expiring license for child care.
You may also encounter the phrase valid in perpetuity, e.g. Hawaii Rev. Stat. §481B-13 (about electronic gift cards/certificates):
…if the gift certificate does not have an expiration date, it shall be valid in perpetuity.
This phrase is generally used in describing the length of effect of a legal document (like a contract or a constitution) or financial instrument rather than an identification, though, so I would consider it a secondary choice.
You could say the identification document has lifelong validity.